two-gamma-variate fitting

Hi Matlab expert:

I am now trying to analysis my fMRI data using the two-gamma-variate fitting. Does any happen to have it ?

Answer 1

[Shadaab Siddiqie]

From my understanding you want to model above expression. You can use symbolic equation to model such expressions like so:

syms x
f = a*(x/(p*q))^p * exp(p-x/q) -b (x/r*s)^r * exp(r-x/s);

since in your case a, p, q, b, r and s are coefficients you have to pre-define it.

[Hang Zeng]

yes, I need to pre-define the coefficient. Thanks a lot!