Create symbolic variable in matlab | Matlab symbolic variable expression addition,multiplication examples | Evaluate symbolic variables in Matlab

Here we give some notes for matlab symbolic variable creation,expression and evaluation.Symbolic variable are used to design a Mathematical expression with some variables.if you can create Symbolic variable means you must use sym or syms function on Matlab.

Syntax : syms ('var1','var2'........'varn');

above syntax for symbolic variable creation. In below example represent symbolic variable creation and expression with evaluation.

>> syms s % symbolic object name is 's'

>> a = (1+2)/s^2 %symbolic equation generation

a =

3/s^2

>> b = (1+s)/s^2

b =

(1+s)/s^2

Two symbolic variable are addition into one varaible as 'c'.

>> c = a+b;

>> c

c =

3/s^2+(1+s)/s^2

>> subs(c,10)

ans =

0.1400

Finally two symbolic variables added and evaluated.In symbolic variable evaluation using subs function.This function evaluate the object on matlab.finally we got the result.

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