MATLAB

Getting Started

Introduction

MATLAB is short for matrix laboratory

---

• MATLAB official website

Matrix and array operations {.row-span-3}

MATLAB allows you to use a single arithmetic operator or function to manipulate all values in a matrix

a + 10

MATLAB will execute the above statement and return the following results:

ans = 3×3
    11    13    15
    12    14    16
    17    18    20

---

sin(a)

MATLAB will execute the above statement and return the following results:

ans = 3×3
    0.8415    0.1411   -0.9589
    0.9093   -0.7568   -0.2794
    0.6570    0.9894   -0.5440

To transpose a matrix, use single quotes (')

a'

---

ans = 3×3
     1     2     7
     3     4     8
     5     6    10

Perform standard matrix multiplication using the * operator, which computes the inner product between rows and columns

p = a*inv(a)

---

p = 3×3
    1.0000         0         0
         0    1.0000         0
         0         0    1.0000

concatenation {.row-span-2}

Concatenation is the process of joining arrays to form larger arrays. In fact, the first array is formed by concatenating its elements. Pairs of square brackets [] are concatenation operators.

A = [a,a]

---

A = 3×6

     1     3     5     1     3     5
     2     4     6     2     4     6
     7     8    10     7     8    10

Concatenating arrays next to each other using commas is called horizontal concatenation. Each array must have the same number of rows. Likewise, semicolons can be used for vertical concatenation if the arrays have the same number of columns.

A = [a; a]

---

A = 6×3

     1     3     5
     2     4     6
     7     8    10
     1     3     5
     2     4     6
     7     8    10

Matrices and arrays {.row-span-3}

To create an array with four elements per row, separate elements with commas (,) or spaces

a = [1 2 3 4]

MATLAB will execute the above statement and return the following results:

a = 1×4
     1     2     3     4

Create a matrix with multiple rows

a = [1 3 5; 2 4 6; 7 8 10]

---

a = 3×3
     1     3     5
     2     4     6
     7     8    10

5×1 column vector of zeros

z = zeros(5,1)

---

z = 5×1
     0
     0
     0
     0
     0

Complex number

A complex number has a real part and an imaginary part, and the imaginary unit is the square root of -1.

sqrt(-1)

---

ans = 0.0000 + 1.0000i

To represent the imaginary part of a complex number, use i or j.

c = [3+4i, 4+3j; -i, 10j]

---

c = 2×2 complex

   3.0000 + 4.0000i   4.0000 + 3.0000i
   0.0000 - 1.0000i   0.0000 +10.0000i

Basic knowledge

Input the command

-	-
ans	Most recently calculated answer
clc	Clear the command line window
diary	Record the text of the command line window into the log file
format	Set the output display format
home	Send cursor reset
iskeyword	Determine if the input is a MATLAB keyword
more	Control paging output in the command line window
commandwindow	Select command window
commandhistory	Open command history window

Objects

-	-
DisplayFormatOptions	Output display format in the command line window

Matrices and Arrays {.row-span-5}

Create and combine arrays

-	-
zeros	Create an array of all zeros
ones	Create an array of all 1s
rand	Uniformly distributed random numbers
true	Logical value 1 (true)
false	logical 0 (false)
eye	identity matrix
diag	Create a diagonal matrix or get the diagonal elements of a matrix
blkdiag	block diagonal matrix
cat	Concatenate arrays.
horzcat	Concatenate arrays horizontally
vertcat	Concatenate arrays vertically
repelem	Repeat array element copy
repmat	Repeat array copy

Create grid

-	-
linspace	Generate linearly spaced vectors
logspace	Generate logarithmic spaced vectors
freqspace	frequency spacing of frequency response
meshgrid	2D and 3D grids
ndgrid	Rectangular grid in N-dimensional space

Determine size, shape and order

-	-
length	The length of the largest array dimension
size	array size
ndims	Number of dimensions of the array
numel	the number of array elements
isscalar	Determine whether the input is a scalar
issorted	Determine if the array is sorted
issortedrows	Determine whether the rows of a matrix or table are sorted
isvector	Determine whether the input is a vector
ismatrix	Determine whether the input is a matrix
isrow	Determine whether the input is a row vector
iscolumn	Determine whether the input is a column vector
isempty	Determine whether the array is empty

Refactor and rearrange

-	-
sort	Sort array
elements sortrows	Sort matrix rows or table rows
flip	Flip the order of elements
fliplr	Flip the array from left to right
flipud	Flip the array from top to bottom
rot90	Rotate an array by 90 degrees
transpose	Transpose a vector or matrix
ctranspose	complex conjugate transpose
permute	permute array dimension
ipermute	Inverse permutation of array dimensions.
circshift	Circular shift array
shiftdim	shift array dimension
reshape	Reshape array
squeeze	Remove dimensions of length 1

index

-	-
colon	vector creation, array subscript and for loop iteration
end	Terminate a code block or indicate the maximum array index
ind2sub	Convert linear index to subscript
sub2ind	Convert subscript to linear index

Value type {.row-span-2}

Create numeric variables

-	-
double	double precision array
single	single precision array
int8	8-bit signed integer array
int16	16-bit signed integer array
int32	32-bit signed integer array
int64	64-bit signed integer array
uint8	Array of 8-bit unsigned integers
uint16	16-bit unsigned integer array
uint32	32-bit unsigned integer array
uint64	64-bit unsigned integer array

Convert between numeric types

-	-
cast	Convert variables to different data types
typecast	Convert data types without changing the underlying data

Query type and value

-	-
allfinite	Determine if all array elements are finite
anynan	Determine if any array element is NaN
isinteger	Determine whether the input is an integer array
isfloat	Determine whether the input is a floating-point array
isnumeric	Determine whether the input is a numeric array
isreal	Determine whether the array uses complex storage
isfinite	Determine which array elements are finite
isinf	Determine which array elements are infinite
isnan	Determine which array elements are NaN

Value range

-	-
eps	Floating point relative precision
flintmax	The largest consecutive integer in floating point format
Inf	Create an array with all values Inf
intmax	The maximum value of a specific integer type
intmin	The minimum value of a specific integer type
NaN	Create an array where all values are NaN
realmax	The largest positive floating point number
realmin	Minimum standard floating point number

Loops and conditional statements

-	-
if, elseif, else	Execute statement when condition is true
switch, case, otherwise	Execute one of multiple sets of statements
for	A for loop used to repeat a specified number of times
while	A while loop that executes repeatedly while a condition is true
try, catch	Execute the statement and catch the resulting error
break	Terminate execution of a for or while loop
return	Return control to the calling script or function
continue	Passes control to the next iteration of a for or while loop
pause	Temporarily suspend the execution of MATLAB
parfor	Parallel for loop
end	Terminate a code block or indicate the maximum array index

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Array of strings

-	-
string	string array
strings	Create a string array that does not contain characters
join	Merge strings
plus	Add numbers, append strings

Character array

-	-
char	character array
cellstr	Convert to a cell array of character vectors
blanks	Create a blank character array
newline	Create newline

Character or string array

-	-
compose	Format data into multiple strings
sprintf	Format data as string or character vector
strcat	Concatenate strings horizontally
append	Merge strings

Char or string -convert input arguments

-	-
convertCharsToStrings	convert character array to string array, other arrays remain unchanged
convertStringsToChars	Convert string array to character array, other arrays remain unchanged
convertContainedStringsToChars	Convert an array of strings at any level of a cell array or structure {.style-list}

CHAR or STRING -convert between numeric and string

-	-
double	double precision array
string	string array
str2double	Convert a string to a double value
num2str	Convert numbers to character arrays

Character or string -determine type and attributes {.row-span-2}

Type of data

-	-
ischar	Determine whether the input is a character array
iscellstr	Determines if input is a cell array of character vectors
isstring	Determine whether the input is an array of strings
isStringScalar	Determine whether the input is a string array containing one element

Text attribute

-	-
strlength	string length
isstrprop	Determine which characters in the input string belong to the specified category
isletter	Determine which characters are letters
isspace	Determine which characters are whitespace characters

character or string -find and replace {.row-span-2}

Look up

-	-
contains	Determine if there is a pattern in the string
matches	Determine if a pattern matches a string
count	Count the number of occurrences of a pattern in a string
endsWith	Determine if a string ends with a pattern
startsWith	Determine whether a string starts with a pattern
strfind	Find a string in other strings
sscanf	Read formatted data from a string

replace

-	-
replace	Find and replace one or more substrings
replaceBetween	Replace the substring between the start and end
strrep	Find and replace substring

String matching pattern -build pattern

-	-
pattern	pattern for searching and matching text

String match pattern -character match pattern

-	-
alphanumericsPattern	match alphanumeric characters
characterListPattern	Match characters in the list
digitsPattern	Match digit characters
lettersPattern	match letter pattern
whitespacePattern	match whitespace characters
wildcardPattern	Match as few characters of any type as possible

String matching pattern -pattern search rules

-	-
optionalPattern	Make pattern matching optional
possessivePattern	Match pattern without backtracking
caseSensitivePattern	Match patterns in a case-sensitive manner
caseInsensitivePattern	Match patterns in a case-insensitive manner
asFewOfPattern	The number of pattern matches should be as few as possible
asManyOfPattern	Pattern matching as many times as possible

String matching pattern -Boundary pattern {.row-span-2}

-	-
alphanumericBoundary	Matches the boundary between alphanumeric and non-alphanumeric characters
digitBoundary	Matches the boundary between digit characters and non-digit characters
letterBoundary	Matches the boundary between alphabetic and non-alphabetic characters
whitespaceBoundary	Matches the boundary between whitespace and non-whitespace characters
lineBoundary	match the beginning or end of a line
textBoundary	match the beginning or end of the text
lookAheadBoundary	match the boundary before the specified pattern
lookBehindBoundary	Boundary after matching the specified pattern

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String matching pattern -custom pattern display

-	-
maskedPattern	pattern with specified display name
namedPattern	Specify a named pattern

String matching pattern -regular expression

-	-
regexp	match regular expression (case sensitive)
regexpi	Match regular expressions (case insensitive)
regexprep	Replace text using regular expressions
regexptranslate	Convert text to regular expressions
regexpPattern	Match the pattern of the specified regular expression

String matching pattern -join and split

-	-
join	Merge strings
plus	Add numbers, append strings
split	Split string at delimiter
splitlines	Split a string at newlines
strjoin	join the strings in the array
strsplit	Splits a string or character vector at the specified delimiter
strtok	Selected string part
extract	Extract a substring from a string
extractAfter	Extract the substring after the specified position
extractBefore	Extract the substring before the specified position
extractBetween	Extract the substring between the starting point and the ending point

String editing {.row-span-2}

-	-
erase	Delete a substring in a string
eraseBetween	Delete the substring between the start and end
extract	Extract a substring from a string
extractAfter	Extract the substring after the specified position
extractBefore	Extract the substring before the specified position
extractBetween	Extract the substring between the starting point and the ending point
insertAfter	Insert a string after the specified substring
insertBefore	Insert a string before the specified substring
pad	Add leading or trailing characters to a string
strip	Remove leading and trailing characters in a string
lower	convert string to lowercase
upper	convert string to uppercase
reverse	Reverse the order of characters in a string
deblank	Remove trailing blanks at the end of a string
strtrim	Remove leading and trailing blanks from a string
strjust	align string

String comparison

-	-
matches	Determine if a pattern matches a string
strcmp	Compare strings
strcmpi	Compare strings (case insensitive)
strncmp	compares the first n characters of a string (case sensitive)
strncmpi	Compare the first n characters of a string (case insensitive )

Basic Arithmetic {.row-span-3}

Addition

• + Add numbers, append strings
• sum sum of array elements
• cumsum cumulative sum
• movsum moving sum

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Subtraction

• - subtraction
• diff difference and approximate derivative

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Multiplication

-	-
.*	Multiplication
*	Matrix multiplication
prod	product of array elements
cumprod	cumulative product
pagemtimes	Matrix multiplication by page
tensorprod	Tensor products between two tensors

Division

-	-
./	Array right division
.\	Array left division
/	Solve the system of linear equations xA = B about x
\	Solve the system of linear equations Ax = B with respect to x

Power

• .^ Element-wise exponentiation
• ^ matrix power

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Transpose

-	-
.’	Transpose a vector or matrix
’	complex conjugate transpose
pagetranspose	Transpose by page
pagectranspose	Complex conjugate transpose by page

Array notation

• uminus unary subtraction
• uplus unary addition

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Modular division and rounding

-	-
mod	Remainder after division (modulo operation)
rem	Remainder after division
idivide	Divisibility with rounding options
ceil	round towards positive infinity
fix	round towards zero
floor	round towards negative infinity
round	round to the nearest decimal or integer

Custom Binary Functions

-	-
bsxfun	Apply element-wise operations on two arrays (with implicit expansion enabled)

Relational operations

value comparison

-	-
==	Determine equality
>=	Determine greater than or equal to
>	Determine greater than
<=	Determine less than or equal to
<	Determine less than
~=	Determine Inequality
isequal	Determine array equality
isequaln	Test array equality, treat NaN values as equal

Logical (Boolean) operations

true or false condition

-	-
Short-circuit &&, ||	Logical operators with short-circuit function
&	Computational logic AND
~	Computational logic NOT
|	Calculation logic OR
xor	Compute logical exclusive OR
all	Determine whether all array elements are non-zero or true
any	Determine if any array elements are non-zero
false	logical 0 (false)
find	Find the index and value of non-zero elements
islogical	Determine whether the input is a logical array
logical	Convert numeric values to logical values
true	Logical value 1 (true)

Set operation

union, intersection, set relationship

-	-
intersect	Set the intersection of two arrays
ismember	Determine whether an array element is a set array member
setdiff	Set the difference between two arrays
setxor	Set XOR of two arrays
union	Set the union of two arrays
unique	Unique value in an array
ismembertol	set membership within tolerance
uniquetol	unique values within tolerance
join	Merge two tables or timetables row by row using a key variable
innerjoin	Inner join between two tables or timetables
outerjoin	Outer join between two tables or timetables

Bitwise operations

set, offset, or compare specific bitfields

-	-
bitand	Bitwise AND
bitor	Bitwise OR
bitxor	Bitwise XOR
bitcmp	Bitwise complement
bitget	Get the bit at the specified position
bitset	Set the bit at the specified position
bitshift	Shift bits by specified number of bits
swapbytes	swap byte order

Data import and export

text file -read and write table or timetable {.row-span-2}

Basic import and export

-	-
readtable	Create a table based on a file
writetable	write table to file
readtimetable	Create a timetable based on a file
writetimetable	Write timetable to file

Define import rules

-	-
detectImportOptions	Generate import options based on file content
delimitedTextImportOptions	Import options object for delimited text
fixedWidthImportOptions	Import options object for fixed-width text files
xmlImportOptions	Import options object for XML file
htmlImportOptions	Import options object for HTML files
wordDocumentImportOptions	Microsoft Word file import options object
getvaropts	Get variable import options
setvaropts	Set variable import options
setvartype	Set variable data type
preview	Preview eight lines of data in the file with import options

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Text files -read and write matrices and arrays

-	-
readmatrix	Read a matrix from a file
writematrix	Write matrix to file
readcell	Read a cell array from a file
writecell	Write a cell array to a file
readvars	Read variables from a file
textscan	Read formatted data from a text file or string
type	Display file content
fileread	Read file content in text format
readlines	Read lines of a file as an array of strings
writelines	Write text to file

Spreadsheet -Read and Write Table or Timetable {.row-span-2}

Basic import and export

-	-
readtable	Create a table from a file
writetable	write table to file
readtimetable	Create a timetable from a file
writetimetable	Write timetable to file
sheetnames	Get sheetnames from a spreadsheet file

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Define import rules

-	-
detectImportOptions	Generate import options based on file content
spreadsheetImportOptions	Spreadsheet import options object
getvaropts	Get variable import options
setvaropts	Set variable import options
setvartype	Set variable data type
preview	Preview eight rows of data in a file with import options

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Spreadsheet -Reading and writing matrices and arrays

-	-
readmatrix	Read a matrix from a file
writematrix	Write matrix to file
readcell	Read a cell array from a file
writecell	Write a cell array to a file
readvars	Read variables from a file
importdata	Load data from a file

images

-	-
imfinfo	Information about graphics files
imread	Reads an image from a graphics file
imwrite	Writes an image to a graphics file
Tiff	MATLAB entry for LibTIFF library routines

Read or write a NetCDF file {.row-span-2}

-	-
nccreate	Create variables in a NetCDF file
ncdisp	Displays NetCDF data source content in the command line window
ncinfo	Returns information about a NetCDF data source
ncread	Read variable data from a NetCDF data source
ncreadatt	Read attribute values in a NetCDF data source
ncwrite	Write data to a NetCDF file
ncwriteatt	Write attributes to a NetCDF file
ncwriteschema	Adds a NetCDF schema definition to a NetCDF file

NetCDF library package -library functions

-	-
netcdf.getChunkCache	Retrieves the chunk cache settings for the NetCDF library
netcdf.inqLibVers	Returns NetCDF library version information
netcdf.setChunkCache	Sets the default chunk cache settings for the NetCDF library
netcdf.setDefaultFormat	Change the default netCDF file format

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NetCDF library package -file operations {.row-span-2}

-	-
netcdf.abort	restores the most recent netCDF file definition
netcdf.close	Closes a netCDF file
netcdf.create	Create a new NetCDF dataset
netcdf.endDef	End netCDF file definition mode
netcdf.inq	returns information about a netCDF file
netcdf.inqFormat	Determines the format of a NetCDF file
netcdf.inqGrps	Retrieves an array of subgroup IDs
netcdf.inqUnlimDims	Retrieves a list of infinite dimensions in a group
netcdf.open	Open NetCDF data source
netcdf.reDef	puts an open netCDF file into definition mode
netcdf.setFill	Set netCDF fill mode
netcdf.sync	Synchronize netCDF files to disk

NetCDF Library Package -Dimensions

-	-
netcdf.defdim	Create netCDF dimensions
netcdf.inqDim	Returns netCDF dimension names and lengths
netcdf.inqDimID	Returns the dimension ID
netcdf.renameDim	Change netCDF dimension names

NetCDF library package -group

-	-
netcdf.defGrp	Create groups in a NetCDF file
netcdf.inqDimIDs	Retrieves a list of dimension identifiers in a group
netcdf.inqGrpName	Retrieve group name
netcdf.inqGrpNameFull	the full pathname of the group
netcdf.inqGrpParent	Retrieves the ID of the parent group.
netcdf.inqNcid	Returns the ID of a named group
netcdf.inqVarIDs	IDs of all variables in the group

NetCDF library package -variable {.row-span-3}

-	-
netcdf.defVarFill	Defines the fill parameter for a NetCDF variable
netcdf.defVar	Create a NetCDF variable
netcdf.defVarChunking	Defines chunking behavior for NetCDF variables
netcdf.defVarDeflate	Defines compression parameters for NetCDF variables
netcdf.defVarFletcher32	Defines validation parameters for NetCDF variables
netcdf.getVar	Read data in a NetCDF variable
netcdf.inqVar	Information about variables
netcdf.inqVarChunking	Determines chunking settings for NetCDF variables
netcdf.inqVarDeflate	Determines compression settings for NetCDF variables
netcdf.inqVarFill	Determines the fill parameter value for a NetCDF variable
netcdf.inqVarFletcher32	About Fletcher32 checksum settings for NetCDF variables
netcdf.inqVarID	Returns the ID associated with the variable name
netcdf.putVar	Writes data to a netCDF variable
netcdf.renameVar	Change netCDF variable name

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NetCDF library package -properties

-	-
netcdf.copyAtt	Copy an attribute to a new location
netcdf.delAtt	Remove netCDF attribute
netcdf.getAtt	Returns the NetCDF attribute
netcdf.inqAtt	Returns information about netCDF attributes
netcdf.inqAttID	Returns the ID of a netCDF attribute
netcdf.inqAttName	Returns the netCDF attribute name
netcdf.putAtt	Write netCDF attributes
netcdf.renameAtt	Change Attribute Name

NetCDF library package -user-defined types

:-	:-
netcdf.defVlen	Define user-defined variable length array type (NC_VLEN)
netcdf.inqUserType	Return information about user-defined type
netcdf.inqVlen	Return information about user-defined NC_VLEN type

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NetCDF library package -Utilities

-	-
netcdf.getConstant	returns the value of the named constant
netcdf.getConstantNames	returns a list of constants known to the netCDF library

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Read or write HDF5 files

-	-
h5create	Create HDF5 dataset
h5disp	Display the content of HDF5 files
h5info	Information about HDF5 files
h5read	Read data from HDF5 dataset
h5readatt	Read attributes from HDF5 files
h5write	Write HDF5 dataset
h5writeatt	Write HDF5 attributes

HDF5 library package {.row-span-4}

-	-
Library (H5)	General-purpose functions for use with entire HDF5 library
Attribute (H5A)	Metadata associated with datasets or groups
Dataset (H5D)	Multidimensional arrays of data elements and supporting metadata
Dimension Scale (H5DS)	Dimension scale associated with dataset dimensions
Error (H5E)	Error handling
File (H5F)	HDF5 file access
Group (H5G)	Organization of objects in file
Identifier (H5I)	HDF5 object identifiers
Link (H5L)	Links in HDF5 file
MATLAB (H5ML)	MATLAB utility functions not part of the HDF5 C library
Object (H5O)	Objects in file
Property (H5P)	Object property lists
Reference (H5R)	HDF5 references
Dataspace (H5S)	Dimensionality of dataset
Datatype (H5T)	Datatype of elements in a dataset

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HDF4 Files -Advanced Functions

-	-
hdfinfo	Information about HDF4 or HDF-EOS files
hdfread	Read data from HDF4 or HDF-EOS files
imread	Read an image from a graphics file
imwrite	Write image to graphics file

Low-level functions -package {.row-span-3}

-	-
matlab.io.hdf4.sd	Interact directly with the HDF4 multi-file scientific dataset (SD) interface
matlab.io.hdfeos.gd	Low-level access to HDF-EOS grid data
matlab.io.hdfeos.sw	Low-level access to HDF-EOS segmented files

Low Level Functions -Functions

-	-
hdfan	The entry of HDF multi-file annotation (AN) interface
hdfhx	The entry of HDF external data (HX) interface
hdfh	The entry of HDF H interface
hdfhd	The entry of HDF HD interface
hdfhe	The entry of HDF HE interface
hdfml	Utilities for use with MATLAB HDF entry functions
hdfpt	Interface of HDF-EOS point object
hdfv	The entry of HDF Vgroup (V) interface
hdfvf	The entry of VF function in HDF Vdata interface
hdfvh	The entry of VH function in HDF Vdata interface
hdfvs	The entry of VS function in HDF Vdata interface
hdfdf24	HDF 24-bit raster image (DF24) interface entry
hdfdfr8	HDF 8-bit raster image (DFR8) interface entry

FITS file -function

-	-
fitsdisp	Display FITS metadata
fitsinfo	Information about FITS files
fitsread	Read data in FITS files
fitswrite	Write image to FITS file

FITS files -file access

-	-
createFile	Create FITS file
openFile	Open FITS file
openDiskFile	Open FITS file
closeFile	Close FITS file
deleteFile	Delete FITS file
fileName	The name of the FITS file
fileMode	I/O mode for FITS files

FITS files -image processing

-	-
createImg	Create FITS image
getImgSize	image size
getImgType	The data type of the image
insertImg	Insert a FITS image after the current image
readImg	read image data
setBscale	Reset image scaling
writeImg	write FITS image

FITS file -keyword {.row-span-2}

-	-
readCard	Header record of keywords
readKey	Keyword
readKeyCmplx	A keyword in the form of a complex scalar value
readKeyDbl	Keyword in the form of double precision value
readKeyLongLong	Keyword in the form of int64
readKeyLongStr	long string value
readKeyUnit	The physical unit string in the key
readRecord	Header record specified by number
writeComment	Write or append COMMENT keyword to CHU
writeDate	Write DATE keyword to CHU
writeKey	Update or add new keywords to the current HDU
writeKeyUnit	write physical unit string
writeHistory	Write or append HISTORY keyword to CHU
deleteKey	Delete key by name
deleteRecord	Delete keywords by record number
getHdrSpace	The number of keywords in the header

FITS files -Header Data Unit (HDU) access

-	-
copyHDU	Copy current HDU from one file to another
getHDUnum	The number of the current HDU in the FITS file
getHDUtype	current HDU type
getNumHDUs	Total number of HDUs in FITS file
movAbsHDU	Move to Absolute HDU Numbering
movNamHDU	Move to the first HDU containing a specific type and keyword value
movRelHDU	Move relative amount of HDU from current HDU
writeChecksum	Calculate and write the checksum of the current HDU
deleteHDU	Delete the current HDU in the FITS file

FITS files -image compression

-	-
imgCompress	Compress HDU from one file to another
isCompressedImg	Determine whether the current image is compressed
setCompressionType	Set image compression type
setHCompScale	Set the scaling parameters of the HCOMPRESS algorithm
setHCompSmooth	Sets smoothing for images compressed with HCOMPRESS
setTileDim	Set tile dimensions

FITS file -ASCII table and binary table {.row-span-3}

-	-
createTbl	Create a new ASCII or binary table extension
insertCol	Insert a column into a table
insertRows	Insert rows into the table
insertATbl	Insert an ASCII table after the current HDU
insertBTbl	Insert a binary table behind the current HDU
deleteCol	Delete a column from a table
deleteRows	Delete rows from the table
getAColParms	ASCII table information
getBColParms	binary table information
getColName	table column name
getColType	Data type, repeat value, width of scaled column
getEqColType	column data type, repeated value, width
getNumCols	The number of columns in the table
getNumRows	the number of rows in the table
readATblHdr	Read the header information from the current ASCII table
readBTblHdr	Read the header information from the current binary table
readCol	Reads rows of ASCII or binary table columns
setTscale	reset image scaling
writeCol	Write elements to an ASCII or binary table column

FITS files -Utilities

-	-
getConstantValue	specify the constant value
getVersion	The revision number of the CFITSIO library
getOpenFiles	list of opened FITS files

Stripe interleaved file

-	-
multibandread	Read a striped interleaved file from a binary file
multibandwrite	Write strip interleaved data to a file

Common Data Format (CDF)

-	-
cdfinfo	Information on Common Data Format (CDF) files
cdfread	Read data in Common Data Format (CDF) files
cdfepoch	Converts a date literal or date sequence value to a date in CDF format
todatenum	Convert CDF epoch objects to MATLAB date serial values

Bag

-	-
cdflib	Direct interaction with CDF library

Read video data

-	-
VideoReader	Create an object to read a video file
read	Read one or more video frames
readFrame	Read the next video frame
hasFrame	Determine whether there are video frames available for reading
getFileFormats	File formats supported by VideoReader
mmfileinfo	Information about multimedia files

Write video data

-	-
VideoWriter	Create an object to write a video file
open	Open a file to write video data
writeVideo	Write video data to a file
close	close the file after writing video data
getProfiles	Description files and file formats supported by VideoWriter

Read or write audio

-	-
audioread	Read audio files
audiowrite	Write audio files
lin2mu	Convert linear audio signal to mu-law
mu2lin	Convert mu-law audio signal to linear format
audioinfo	Information about audio files

Play audio

-	-
audioplayer	Object for playing audio
isplaying	Determine whether playback is in progress
pause	Pause playback or recording
play	Play audio from audioplayer object
playblocking	Play audio in audioplayer object, keep control until playback is complete
resume	Resume playback or recording from the paused state
stop	Stop playing or recording

Record audio

-	-
audiorecorder	object for recording audio
getaudiodata	Store the recorded audio signal in a numeric array
getplayer	Create an associated audioplayer object
isrecording	Determine if recording is in progress
record	Record audio into audiorecorder object
recordblocking	Record audio into an audiorecorder object, keep control until recording is complete

Play sound

-	-
audiodevinfo	Information about audio devices
audiodevreset	Refresh the list of available audio devices
sound	Convert signal data matrix to sound
soundsc	Scale data and play it as sound
beep	generate operating system beep

Reading and writing XML documents

-	-
matlab.io.xml.dom.DOMWriter	Write serialized XML documents Injector
matlab.io.xml.dom.EntityResolver	Abstract base class of entity resolver
matlab.io.xml.dom.FileWriter	Writer for creating text files
matlab.io.xml.dom.Locator	The location of the element in the XML file
matlab.io.xml.dom.Parser	XML markup parser
matlab.io.xml.dom.ParserConfiguration	XML parser options
matlab.io.xml.dom.ParseError	Specified XML tag parsing error
matlab.io.xml.dom.ParseErrorHandler	Abstract base class for parse error handlers
matlab.io.xml.dom.ParseErrorLocator	Specifies location of parse error
matlab.io.xml.dom.ParseErrorSeverity	Indicates the severity of XML tag parsing errors enum class
matlab.io.xml.dom.ResourceIdentifier	XML resource identifier
matlab.io.xml.dom.ResourceIdentifierType	XML resource identifier type
matlab.io.xml.dom.WriterConfiguration	XML DOM Writer Options

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W3C DOM

-	-
matlab.io.xml.dom.Attr	Attributes of XML elements
matlab.io.xml.dom.CDATASection	CDATA section
matlab.io.xml.dom.Comment	Comments in XML documents
matlab.io.xml.dom.Document	XML document
matlab.io.xml.dom.DocumentFragment	document node group
matlab.io.xml.dom.DocumentType	document type
matlab.io.xml.dom.Element	element of XML document
matlab.io.xml.dom.Entity	Entity defined by document type
matlab.io.xml.dom.NamedNodeMap	A set of document nodes with names
matlab.io.xml.dom.NodeList	document node list
matlab.io.xml.dom.Notation	Notation in document type definition
matlab.io.xml.dom.ProcessingInstruction	XML processing instruction
matlab.io.xml.dom.Text	Text in an XML document
matlab.io.xml.dom.TypeInfo	schema type information

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XML Transformation

-	-
matlab.io.xml.transform.CompiledStylesheet	Compiled stylesheet
matlab.io.xml.transform.ResultDocument	Store the transformation result as a document
matlab.io.xml.transform.ResultString	Store the transformation result as a string
matlab.io.xml.transform.ResultFile	Store the transformation result as a file
matlab.io.xml.transform.SourceDocument	XML source document for transformation
matlab.io.xml.transform.SourceFile	XML source file for transformation
matlab.io.xml.transform.SourceString	XML source string for transformation string
matlab.io.xml.transform.StylesheetSourceDocument	Stylesheet source for transformation document
matlab.io.xml.transform.StylesheetSourceFile	Stylesheet source for transformation document
matlab.io.xml.transform.StylesheetSourceString	XSL source string for transformation string
matlab.io.xml.transform.Tracer	Trace execution of stylesheet

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XPath query

-	-
matlab.io.xml.xpath.CompiledExpression	Compiled XPath expression
matlab.io.xml.xpath.EvalResultType	The result type of XPath expression calculation
matlab.io.xml.xpath.Evaluator	XPath expression evaluator
matlab.io.xml.xpath.PrefixResolver	For namespace prefix resolver Abstract base class for

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JSON format

-	-
jsondecode	Decode text in JSON format
jsonencode	Create JSON-formatted text from structured MATLAB data

Workspace variables and MAT-file {.row-span-2}

-	-
load	Load file variables into the workspace
save	Save workspace variables to a file
matfile	Access and change variables in a MAT-file without loading the file into memory
disp	Display the value of the variable
formattedDisplayText	Capture display output as a string
who	List variables in the workspace
whos	List variables in the workspace with their size and type
clear	Delete items from the workspace and release system memory
clearvars	Clear variables in memory
openvar	Open a workspace variable in the variable editor or other graphical editing tools
Workspace Browser	Open the Workspace Browser to manage the workspace

Low-level file I/O {.row-span-2}

-	-
fclose	close one or all open files
feof	Detect the end of the file
ferror	File I/O error message
fgetl	Read lines in a file and remove line breaks
fgets	Read lines in a file and keep newlines
fileread	Read file content in text format
fopen	Open a file or get information about opening a file
fprintf	Write data to a text file
fread	Read data in binary files
frewind	Move the file position indicator to the beginning of the opened file
fscanf	Read the data in the text file
fseek	Move to the specified position in the file
ftell	current location
fwrite	Write data to a binary file

Serial and USB Communication -Connection and Configuration

-	-
serialportlist	List of serial ports connected to your system
serialport	Connect to a serial port
configureTerminator	Set the terminator for ASCII string communication with the serial port
configureCallback	Set callback function and trigger conditions for communication with serial port devices

Serial and USB communication -read and write

-	-
read	Read data from the serial port
readline	Read ASCII string data line from serial port
write	write data to serial port
writeline	Write ASCII data line to serial port

Serial and USB communication -control pins and memory

-	-
flush	Clear the serial port device buffer
getpinstatus	Get the serial port status
setRTS	Set the serial port RTS pin
setDTR	Set the serial DTR pin

TCP/IP communication -connection and configuration

-	-
tcpclient	Create a TCP/IP client connection to a TCP/IP server
echotcpip	Start or stop the TCP/IP echo server
configureTerminator	Set terminator for ASCII string communication with remote host via TCP/IP
configureCallback	Set callback function and trigger condition for communication with remote host via TCP/IP

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TCP/IP communication -read and write

-	-
read	Read data on a remote host via TCP/IP
readline	Read ASCII string data line from remote host via TCP/IP
write	Write data to a remote host via TCP/IP
writeline	Write ASCII data line to remote host via TCP/IP
flush	Flush buffers for communication with remote hosts via TCP/IP

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Bluetooth communication -connection and configuration

-	-
bluetoothlist	Scan for nearby Bluetooth classic devices
bluetooth	Connect to Bluetooth classic device
configureTerminator	Set terminator for ASCII string communication with Bluetooth device
configureCallback	Set callback function and trigger condition for communication with Bluetooth device

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Bluetooth communication -read and write {.row-span-2}

-	-
read	Read data from a Bluetooth device
readline	Read ASCII string data line from Bluetooth device
write	write data to Bluetooth device
writeline	Write ASCII data line to Bluetooth device
flush	Clear Bluetooth device buffer

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Bluetooth Low Energy Communication {.row-span-2}

-	-
blelist	Scan for nearby low energy Bluetooth peripherals
ble	Connect to low energy Bluetooth peripherals
characteristic	Access to characteristics of Bluetooth low energy peripherals
descriptor	Access descriptors on Bluetooth low energy peripherals
read	Read characteristic or descriptor data on a Bluetooth low energy peripheral device
write	Write data to a characteristic or descriptor of a Bluetooth low energy peripheral device
subscribe	Subscribe to characteristic notifications or instructions
unsubscribe	Unsubscribe characteristic notifications and instructions

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Web Services

-	-
webread	Read content from RESTful web services
webwrite	Write data to RESTful web service
websave	Save content in RESTful web service to file
weboptions	Specify parameters for RESTful web services
web	Open a webpage or file in a browser
sendmail	Send email to address list

FTP file operations {.row-span-2}

-	-
ftp	Connect to an FTP server to access its files
sftp	Connection to SFTP server to access its files
ascii	Set FTP transfer mode to ASCII
binary	Set FTP transfer mode to binary
cd	Change or view the current folder on an SFTP or FTP server
close	Close the connection to the SFTP or FTP server
delete	Delete files on SFTP or FTP server
dir	List folder contents on SFTP or FTP server
mget	Download files from SFTP or FTP server
mkdir	Create a new folder on an SFTP or FTP server
mput	Upload files or folders to SFTP or FTP server
rename	Rename a file on an SFTP or FTP server
rmdir	Delete a folder on an SFTP or FTP server

Internet of Things (IoT) Data

-	-
thingSpeakRead	Read data stored in ThingSpeak channel
thingSpeakWrite	write data to ThingSpeak channel