Hi friends….!!
This time we are here to start our journey of learning MATLAB , a very useful
and powerful software for electronics lovers and others too . So in this
article first of all we will discuss about some basics of MATLAB …..lets start…
DESKTOP INTRODUCTION
This is the
first window which u will see after starting MATLAB.
Now here you
can see these sections-
CURRENT FOLDER- In this section you can you can
access your files to use.
COMMAND WINDOW- Here you will enter your commands
in command line started with (>>)
WORKSPACE- This section explore all the data
which you create or import from files.
COMMAND HISTORY- It is a very important panel , here
you can view your commands and you can can rerun those commands too.
USE OF VARIABLES
Starting from
very basic , you can se MATLAB as a simple calculator. For this you have to
enter the desired mathematical expression in command line , say it is 1+2*5, so
just type it in command line.
>>
1+2*5
Press enter
and MATLAB will respond as
ans =
11
Now you can
see we have not assigned any variable and MATLAB used a default variable ans
for this calculation now you can choose any variable for it, say ‘x’ . So we
will type
>>
x=1=2*5
And MATLAB
will respond as
x =
11
Now this
variable can be used for further calculations as well like,
>> y=x*5
This time
MATLAB will respond as
y =
55
This is
the list for some basic arithmetic operation commands to be used for simple
calculations
+ addition
- subtraction
* multiply
/ divide
HIERARCHY OF ARITHMATICAL OPERATIONS
MATLAB
performs the arithmetical operation in same manner as taught in high school
algebra first parentheses then exponents (from left to right), then division(left
to right), multiplication( left to right), addition( left to right), sand at
last subtraction ( left to right).
Use of parentheses
Like simple
mathematics calculations parentheses can also be used in MATLAB for solving
expressions and use of parentheses will give a different answer of the
expression.
For example-
In matlab it
becomes
>>
1/(2+4)+4/5*6/7
ans =
0.8524
But without
parentheses it will be
>> 1/2
+4+4/5*6/7
ans =
5.1857
So be
careful using parentheses.
ERROR MESSAGE AND CORRECTION
Some times
an error message displays if you will use a wrong command like
>> 2x
??? 2x
|
Error:
Unexpected MATLAB expression.
To correct
this mistake you can obviously retype or you can edit and re execute same command
by using UP ARROW KEY.
MANAGING THE WORKSPACE
clear
command
>>clear
clear command is used to clear all the
variables from the workspace, sometime similar variable in two different
operations can cause ambiguity.
who
and whos command
>> who
This command
gives detail of all the variable in the memory. whos is more specific one and provides more details.
SAVING THE WORK SESSION
diary , diary off and diary on
command
during your
work if you want to save any particular work session you can use diary command
as
>>
diary
Or
>>
diary Filename
Here filename
can be any arbitrary name chosen by you.
diary command is used to save entire
MATLAB session but you can stop recording at any instant by using diary off command and you can again
start it with diary on command. The created
file is a simple text file can be opened and edited in any editor.
HOW TO USE MULTIPLE COMMAND IN SINGLE
LINE
MATLAB
provides us facility to use multiple commands in single line. These different
commands should be separated by comma(,) or semicolon(;) like
>>
a=9;c=a+9,d=c+9
c =
18
d =
27
CLEARING , ABORTING AND CONTINUING
>> clc
Clearing the command window
>>
ctrl
Aborting the
MATLAB session
>>…
To continue
a line.
GETTING HELP
To get help
about various MATLAB operations you can use HELP BROWSER of matlab by clicking
on the HELP BROWSER ICON
On the other
hand you can use help command
>>help
So friends
these are the basics of MATLAB, I hope it was useful for you …..we will learn
about various commands and operations in upcoming tutorials. If you have any
query , doubt or critical views just leave a comment here………
THNX
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