Mathematica also struggles with this integral. When this fails (by returning a call to itself) it may be for several reason: the integral may not exist, the integral may converge too slowly, singularities may cause issues, the integrand may be highly oscillatory or non-smooth, etc. In some cases vpa can be used to for a numeric solution. It is unlikely that there is an analytic solution to this integral so using int may not be a good choice. There are something wrong in above Matlab code? (I, myself, could not find the bug so far) My question is why vpa in this case could not return to a real value? Then, I try to use vpato calculate that integral,and get the result like this vpa(int(int(f,x,-Inf,Inf),y,-Inf,Inf),5) Warning: Explicit integral could not be found.
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