How to solve this equation for Laplace transform with matlab?
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Walter Roberson
il 28 Feb 2020
Your zeta is a symbolic expression in k and y according to symvar(), but it also contains k2 inside fourier() calls.
Perhaps you should do
kvals = 0:100;
yvals = linspace(-200,200,101);
[K,Y] = meshgrid(kvals, yvals);
Zsym = subs(zeta, {k, y}, {K, Y});
Z = double(Zsym);
surf(K,Y,Z)
However in practice this does not work: after the substitution, double() is not able to resolve some of the values to numeric. I discovered that some of them can be converted to a better form by using simplify(Zsym), but that is slow.
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