Biexponential fit help?

So I generated a decay of some data using this code, and the decay works! But now I am trying to fit it into a biexponential fit. I have this code, but it is not working for some reason. Does anybody know what I should do?

Decay code (works):

a=Data{1,1};

decay=get(a,'decay');

Biexponential fit code (does not work):

ft = fittype('exp2');

ft(a,b,t1,t2,x) = a*exp(b*x) + t1*exp(t2*x);

Answer 1

[Swetha Polemoni]

Hi,

The following answer might help you.

Biexponential fitting (non-linear regression)on Matlab