question about convolution and foureir transformations

hello...

I have a question about the convolution of two functions, I found the "conv" function in Matlab, but this is for discrete values, I want to compute the convolution of two function and I used the Fourier transformation, theoretically like this :

f1 = sym('exppdf(t,55)');                %%function 1
f2 = sym('wblpdf(t,2,6)');               %%function 2
f = ifourier(fourier(f1)*fourier(f2))    %%in theory, this is the convolution function using the fourier transformation

but the result returned by matlab is an integral not evaluated :

1/4/pi^2*int(4*pi^2*exppdf(-_U1,55)*wblpdf(x+_U1,2,6),_U1 = -Inf .. Inf)

my question is how can I evaluate (with Matlab) this expression, or how can I Plot it...??

Thank you very much

[Walter Roberson]

I'm not sure how this differs from your previous question http://www.mathworks.co.uk/matlabcentral/answers/46721-how-can-i-comput-convolution-of-two-functions ?

Answer 1

[Greg Heath]

Since you cannot get an explicit symbolic expression, obtain a numerical result using conv(a,b) or ifft(fft(a).*fft(b))