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At this stage, we're sure you have some idea about the basics of Matlab. If not, don't worry, here is a great article that could help. In this article, we provide a collection of frequently used Matlab commands which you can use for quick reference. Read on.

MATLAB COMMANDS FOR QUICK REFERENCE

clcClear command window
clearClear system memory
clear xClear x from memory
commandwindowopen/select commandwindow
whoslists data structures
whos xsize, bytes, class and attributes of x
ansLast result
close allcloses all gures
close(H)closes gure H
winopen(pwd)Open current folder
class(obj)returns objects class
save filenamesaves all variables to .mat le
save filename x,ysaves x,y variables to .mat le
save -append filename xappends x to .mat le
load filenameloads all variables from .mat le
verLists version and toolboxes
beepMakes the beep sound
doc functionHelp/documentation for function
docsearch stringsearch documentation
web google.comopens webadress
inputdlgInput dialog box
methods(A)list class methods for A

MATLAB STATISTICAL COMMANDS

distrndrandom numbers from dist
distpdfpdf from dist
distcdfcdf dist
distrndrandom numbers from dist
hist(x)histogram of x
histfit(x)histogram and
*Standard distributions (dist)norm, t, f, gam, chi2, bino
*Standard functionsmean,median,var,cov(x,y),corr(x,
*quantile(x,p) is not textbook version.
(It uses interpolation for missing quantiles.

MATLAB KEYBOARD SHORTCUTS

edit filenameOpens filename in editor
AltDisplays hotkeys
F1Help/documentation for highlighted function
F5Run code
F9Run highlighted code
F10Run code line
F11Run code line, enter functions
Shift + F5Leave debugger
F12Insert break point
Ctrl+Page up/downMoves between tabs
Ctrl+ShiftMoves between components
Ctrl + CInterrupts code
Ctrl + DOpen highlighted codes le
Ctrl + R/T+Comment/uncomment line
Ctrl + NNew script
Ctrl + WClose script
Ctrl+Shift+dDocks window
Ctrl+Shift+uUndocks window
Ctrl+Shift+mmax window/restore size

MATLAB BUILT-IN FUNCTIONS AND CONSTANTS

abs(x)absolute value
pi3:1415:::
inf
epffloating point accuracy
1e6106
sum(x)sums elements in x
cumsum(x)Cummulative sum
prodproduct of array elements
cumprod(x)cumulative product
diffdifference of elements
round/ceil/fix/floorStandard functions.

*Standard functions: sqrt, log, exp, max, min, Bessel

*Factorial(x) is only precise for x < 21

MATLAB CELL COMMANDS

A cell may contain any kind of variables

x=cell(a,b)a b cell array
x{n,m}access cell n,m
cell2mat(x)transforms cell to matrix cellfun
cellfun('fname',C)Applies fname to cells in C

MATLAB-STRINGS AND REGULAR EXPRESSIONS

strcompcompare strings (case sensitive)
strcompicompare strings (not case sensitive)
strncompas strcomp, but only n first letters
strfindfind string within a string , gives start position
regexpSearch for regular expression

MATLAB LOGICAL OPERATORS

&&short circuit AND.
&AND
||short circuit or
|or
~not
==equality comparision
isa(obj, ’class_name’)is object in class
~=not equal

*Other logical operators: <,>,>=,<=

*All above operators are elementwise

*Class indicators: isnan, isequal, ischar, isinf, isvector , isempty, isscalar, iscolumn

*Short circuits only evaluate second criteria if
first criteria is passed, it is therefore faster.
And useful fpr avoiding errors occuring in second criteria

*non-SC are bugged and short circuit anyway

MATLAB VARIABLE GENERATION

j:k 		row vector [j,j+1,...,k]
j:i:k row vector [j,j+i,...,k]
linspace(a,b,n) n points linearly spaced and including a and b
NaN(a,b) a×b matrix of NaN values
ones(a,b) a×b matrix of 1 values
zeros(a,b) a×b matrix of 0 values
meshgrid(x,y) 2d grid of x and y vectors
[a,b]=deal(NaN(5,5)) declares a and b
global x gives x global scope

MATLAB TABLES COMMANDS

T=table(var1,var2,...,varN) 	Makes table*
T(rows,vars) 			get sub-table
T{rows,vars} 			get data from table
T.var or T.(varindex) 		all rows of var
T.var(rows) 			get values of var from rows
summary(T) 			summary of table
T.var3(T.var3>5)=5 		changes some values
T.Properties.Varnames 		Variable names
T = array2table(A) 		! make table from array
T = innerjoin(T1,T2) 		innerjoin
T = outerjoin(T1,T2) 		outerjoin !

Rows and vars indicate rows and variables.
tables are great for large datasets, because they
use less memory and allow faster operations.
*rowfun is great for tables, much faster than eg. looping

MATLAB MATRIX AND VECTOR OPERATIONS & FUNCTIONS

x=[1, 2, 3] 		1x3 (Row) vector
x=[1; 2; 3] 		3x1 (Column) vector
x=[1, 2; 3, 4] 		2x2 matrix
x(2)=4 			change index value nr 2
x(:) 			All elements of x (same as x)
x(j:end) 		j’th to last element of x
x(2:5) 			2nd to 5th element of x
x(j,:) 			all j row elements
x(:,j) 			all j column elements
diag(x) 		diagonal elements of x
x.*y 			Element by element multiplication
x./y 			Element by element division
x+y 			Element by element addition
x-y 			Element by element subtraction
A^n 			normal/Matrix power of A
A.^n 			Elementwise power of A
A’ 			Transpose
inv(A) 			Inverse of matrix
size(x) 		Rows and Columns
eye(n) 			Identity matrix
sort(A) 		sorts vector from smallest to largest
eig(A) 			Eigenvalues and eigenvectors
numel(A) 		number of array elements
x(x>5)=0 		change elemnts >5 to 0
x(x>5) 			list elements >5
find(A>5) 		Indices of elements >5
find(isnan(A)) 		Indices of NaN elements
[A,B] 			concatenates horizontally
[A;B] 			concatenates vertically

For functions on matrices, see bsxfun,arrayfun or repmat
*if arrayfun/bsxfun is passed a gpuArray, it runs on GPU.
*Standard operations: rank,rref,kron,chol
*Inverse of matrix inv(A) should almost never be used, use RREF
through \ instead: inv(A)b = A\b

MATLAB PLOTTING COMMANDS

Plotting commands
fig1 = plot(x,y) 		2d line plot, handle set to fig
set(fig1, ’LineWidth’, 2) 	change line width
set(fig1, ’LineStyle’, ’-’) 	dot markers (see *)
set(fig1, ’Marker’, ’.’) 	marker type (see *)
set(fig1, ’color’, ’red’) 	line color (see *)
set(fig1, ’MarkerSize’, 10) 	marker size (see *)
set(fig1, ’FontSize’, 14) 	fonts to size 14
figure 				new figure window
figure(j) 			graphics object j
get(j) 				returns information
				graphics object j
gcf(j) 				get current figure handle
subplot(a,b,c) 			Used for multiple
				figures in single plot
xlabel(’\mu line’,’FontSize’,14)	names x/y/z axis
ylim([a b]) 				Sets y/x axis limits
f					or plot to a-b
title(’name’,’fontsize’,22)		names plot
grid on/off; 				Adds grid to plot
legend(’x’,’y’,’Location’,’Best’) 	adds legends
hold on 				retains current figure
					when adding new stuff
hold off 			restores to default
(no hold on)
set(h,’WindowStyle’,’Docked’); 	Docked window style for plots
datetick(’x’,yy) 		time series axis
plotyy(x1,y1,x2,y2) 		plot on two y axis
				refreshdata refresh data in graph
				if specified source
drawnow 			do all in event queue
* Some markers: ’, +, *, x, o, square
* Some colors: red, blue, green, yellow, black
* color shortcuts: r, b, g, y, k
* Some line styles: -, --, :, -.
* shortcut combination example: plot(x,y,’b--o’)

MATLAB OUTPUT COMMANDS

format short 		Displays 4 digits after 0
format long 		Displays 15 digits after 0
disp(x) 		Displays the string x
disp(x) 		Displays the string x
num2str(x) 		Converts the number in x to string
num2str([’nA is = ’	OFTEN USED!
num2str(a)]) 		!
mat2str(x) 		Converts the matrix in x to string
int2str(x) 		Converts the integer in x to string
sprintf(x) 		formated data to a string

MATLAB SYSTEM COMMANDS

addpath(string) 	adds path to workspace
genpath(string) 	gets strings for subfolders
pwd 			Current directory
mkdir 			Makes new directory
tempdir 		Temporary directory
inmem 			Functions in memory
exit 			Close matlab
dir 			list folder content
ver 			lists toolboxes

MATLAB DATA IMPORT & EXPORT COMMANDS

xlsread/xlswrite 	Spreadsheets (.xls,.xlsm)
readtable/writetable 	Spreadsheets (.xls,.xlsm)
dlmread/dlmwrite 	text files (txt,csv)
load/save -ascii 	text files (txt,csv)
load/save 		matlab files (.m)
imread/imwrite 		Image files

MATLAB DEBUGGING COMMANDS

keyboard 	Pauses exceution
return 		resumes exceution
tic 		starts timer
toc 		stops timer
profile on 	starts profiler
profile viewer 	Lets you see profiler output
try/catch 	Great for finding where errors occur
dbstop if error stops at first error inside try/catch block
dbclear     	clears breakpoints
dbcont 		resume execution
lasterr 	Last error message
lastwarn 	Last warning message
break 		Terminates executiion of for/while loop
waitbar 	Waiting bar

MATLAB PROGRAMMING COMMANDS

return 		Return to invoking function
exist(x) 	checks if x exists
G=gpuArray(x) 	Convert varibles to GPU array
function [y1,...,yN] = myfun(x1,...,xM)
Anonymous functions not stored in main programme
myfun = @(x1,x2) x1+x2;
or even using
myfun2 = @myfun(x) myfun(x3,2)

MATLAB NON-LINEAR METHODS

quad(fun,a,b) 		simpson integration of @fun
			from a to b
fminsearch(fun,x0) 	minimum of unconstrained
			multivariable function
			using derivative-free method
fmincon 		minimum of constrained function
Example: Constrained log-likelihood maximization, note the -
Parms_est = fmincon(@(Parms) -flogL(Parms,x1,x2,x3,y), InitialGuess,[],[],[],[],LwrBound,UprBound,[]);

MATLAB CONDITIONS AND LOOPS

for i=1:n
	procedure 	Iterates over procedure
end 			incrementing i from 1 to n by 1

while(criteria)
	procedure 	Iterates over procedure
end 			as long as criteria is true(1)


if(criteria 1) 		if criteria 1 is true do procedure 1

procedure1
elseif(criteria 2) 	,else if criteria 2 is true do procedure 2

procedure2
else 			, else do procedure 3

procedure3
end

switch switch_expression if case n holds,
case 1 			run procedure n. If none holds
procedure 1 		run procedure 3

case 2 (if specified)
	procedure 2
otherwise
	procedure 3
end

MATLAB TIPS AND TRICKS

Disclaimer: All of the above information has been shared from publicly available sources for information only. All copyrights acknowledged.

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