error message undefined function or variable ‘integral’ .

Dear all ,i made numerical integration in script bit i get error message : undefined function or variable ‘integral’ .

Answer 1

[madhan ravi]

It’s integral not 'integral' no strings around

[Mohamad]

The code given below , when I run it i get the message :

Undefined function or variable 'integral'.

% FS for triangle periodic triangle function
% Compelx exponential FS
clc
clear;
a=-1
b=1
T0=b-a
N=11
F0=1/T0
wi=[-N:N]*2*pi/T0;
t=(a:0.2:b)';
D=zeros(2*N+1,1);
xt=my_tri(t);
fun1 = @(t)my_tri(t);
q1 = integral(fun1, a,b);
D(N+1)=q1/T0;

[madhan ravi]

I suspect that integral is available only from 2012a which version are you using?

see https://www.mathworks.com/help/releases/R2012a/techdoc/ref/integral.html

so try

https://www.mathworks.com/help/matlab/ref/quad.html

q1 = quad(fun1, a,b);

might work

[Mohamad]

Ok , thanks a lot , the problem solved

[madhan ravi]

Anytime :)