Calculating a convolution using conv vs. a loop

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Hi,
I'm currently calculating the convolution of a Gaussian and a power law using the following code snippet:
for j=1:1:size(Axis_Tw,1)
t = Axis_Tw(j);
if Axis_Tw(j) <= 100
temp = 0;
CPara = 0;
for i=1:1:nt+1
CPara = CPara + Gas(temp,Gparams)*PowerLaw(t-temp,Eparams)*dt;
temp = temp + dt;
end
FPara(j) = CPara;
else
FPara(j) = PowerLaw(t,Eparams);
end
end
I'm trying to use conv to do this instead of a loop. I'm confused on how to do this. Can conv take functions as arguments or can I only use vectors? I've tried evaluating Gas and PowerLaw for Axis_Tw and then passing those arrays into conv, but the result is very different (as in several hundred orders of magnitude).
Thanks, Charles

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