MATLAB: Error while executing textbook MATLAB code

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I am studying Fourier transform through book of alex palamides and it states that there is a property of fourier transform due to which convolution of two time domain signals is equal to inverse fourier*(product of fourier transforms of signals)
But when i try to put this concept to MATLAB as demonstrated in book , i get error shown in attached photo. Although i have wrote exactly same code as on page 312 of Book
My code is follow:
syms t w
x1=heaviside(t)-heaviside(t-2);
x2=heaviside(t)-heaviside(t-4);
X1=fourier(x1,w);
X2=fourier(x2,w);
right =ifourier(X1*X2,t);
ezplot(right,[0 8])

Best Answer

In your release of MATLAB, ezplot() was not compatible with plotting symbolic expressions, and fplot() had to be used instead.
However, the ifourier() is giving unusable results that neither ezplot() nor fplot() can use.
The work-around, valid from R2012a, is:
right = ifourier( rewrite(X1*X2, 'exp'), t);
fplot(right, [0 8])
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