MATLAB- COMMANDS

COMMANDS:-                        

MATLAB is an interactive program for numerical computation and visualization. You can enter a command by typing at the MATLAB prompt ">>" on the command window. In this section, we will discuss some general MATLAB commands which are used in a daily basis.

Commands for working with the system:-

In  MATLAB command library there are various useful commands for working with the system, like saving this the current work in the workspace as a file and loading the file later. It also provides various commands for displaying date, listing files in the directory, displaying current directory, etc.

Some commonly used system-related commands:-

Command	Purpose
cd	Changes current directory.
date	Displays the current date.
delete	Deletes a file.
diary	Switches on/off diary file recording.
dir	Lists all files in the current directory.
load	Loads workspace variables from a file.
path	Displays search path.
pwd	Displays current directory.
save	Saves workspace variables in a file.
type	Displays contents of a file.
what	Lists all MATLAB files within the current directory.
wklread	Reads .wk1 spreadsheet file.

Commands for Managing a Session:-

MATLAB provides various commands for managing a session. 

The following table provides all such commands:-

Command	Purpose
clc	Clears command window.
clear	Removes variables from memory.
exist	Checks for existence of file or variable.
global	Declares variables to be global.
help	Searches for a help topic.
lookfor	Searches help entries for a keyword.
quit	Stops MATLAB.
who	Lists current variables.
whos	Lists current variables long display.

Commands for Input and Output:-

In  MATLAB command library there are some commands which are related to input and output:-

Command	Purpose
disp	Displays contents of an array or string.
fscanf	Read formatted data from a file.
format	Controls screen-display format.
fprintf	Performs formatted writes to screen or file.
input	Displays prompts and waits for input.
;	Suppresses screen printing.

The fscanf and fprintf commands be like C scanf and printf functions. 

They support the following format codes:-

Format Specifier	Purpose
%s	Format as a string.
%d	Format as an integer.
%f	Format as a floating-point value.
%e	Format as a floating-point scientific notation.
%g	Format within the most compact form:- (%f  or %e)
\n	Insert a new line
\t	Insert a tab

Commands for Vector, Matrix and Array:-

Table of commands used for working with arrays, matrices and vectors −

Command	Purpose
cat	Concatenates arrays.
find	Finds indices of nonzero elements.
length	Computes the number of elements.
linspace	Creates regularly spaced vector.
logspace	Creates logarithmically spaced vector.
max	Returns largest element.
min	Returns smallest element.
prod	Product of each column.
reshape	Changes size.
size	Computes array size.
sort	Sorts each column.
sum	Sums each column.
eye	Creates an identity matrix.
ones	Creates an array of ones.
zeros	Creates an array of zeros.
cross	Computes matrix cross products.
dot	Computes matrix dot products.
det	Computes determinant of an array.
inv	Computes the inverse of a matrix.
pinv	Computes pseudoinverse of a matrix.
rank	Computes rank of a matrix.
rref	Computes reduced row echelon form.
cell	Creates cell array.
celldisp	Displays cell array.
cellplot	Displays a graphical representation of the cell array.
num2cell	Converts numeric array to cell array.
deal	Matches input and output lists.
iscell	Identifies cell array.

Commands for Plotting:-

MATLAB provides numerous commands for plotting graphs. 

Table of commonly used commands for plotting:-

Command	Purpose
axis	Sets axis limits.
fplot	Intelligent plotting of functions.
grid	Displays gridlines.
plot	Generates XY plot.
print	saves plot to a file.
title	Puts text at top of plot.
xlabel	Adds text label to x-axis.
ylabel	Adds text label to y-axis.
axes	Creates axes objects.
close	Closes the current plot.
close all	Closes all plots.
figure	Opens a new figure window.
gtext	Enables label placement by mouse.
hold	Freezes current plot.
legend	Legend placement by mouse.
refresh	Redraws current figure window.
set	Specifies properties of objects such as axes.
subplot	Creates plots in subwindows.
text	Places string in figure.
bar	Creates bar chart.
loglog	Creates log-log plot.
polar	Creates polar plot.
semilogx	Creates semilog plot. logarithmic abscissa.
semilogy	Creates semilog plot. logarithmic ordinate.
stairs	Creates stairs plot.
stem	Creates stem plot.

contact-form