MATLAB: Error using plot ; spectrum of function

plot

Why I get error using the following code?

    syms t w;
syms g h;
g=fourier(exp(-1*(t^2)));
h=abs(g);
w=-10.1:10.1;
plot(w,h);

plot(w, subs(h))

The Fourier (and Laplace) transforms of the Dirac delta function are uniformly 1 for all omega (or ‘s’).

That is the result you get in ‘g(w)’.

I would calculate the derivative and create the anonymous function for ‘Vg’ with:

Vg = matlabFunction(diff(Mg,t), 'Vars',{t});

With that change, it runs without error, although the plot generates a long ‘Warning’ message.