'Why i am getting blank graph?How can i solve this issue?

I am trying to plot symbolic variable in MATLAB, for which I have used the same strategy that is available in an answer to a similar question.

This is my code, which outputs a blank graph:

syms t w
x=exp(-t^2)
h=exp(-t)*heaviside(t)+exp(t)*heaviside(-t)
X=fourier(x,w);
H=fourier(h,w);
right=ifourier( rewrite(X*H, 'exp'),t)
fplot(right,[0 8])

How can I make the graph appear?

matlabmathsignal-processingsymbolic-math


Solution 1:[1]

The problem is that MATLAB ifourier function cannot compute the inverse Fourier transform of the product X*H.

Check that X*H returns:

X*H

enter image description here

Rewriting the expression does not change it at all:

rewrite(X*H, 'exp')

enter image description here

Either way, when computing the inverse Fourier transform:

right=ifourier( X*H,t)

enter image description here

Documentation on the ifourier function states that:

If ifourier cannot transform the input, then it returns an unevaluated call to fourier.

Since it cannot evaluate explicitly the function, it cannot plot it.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Thales

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