fittype with integration limits containing independent variable

Hello,

I am trying to do a custom fit of an equation of the form

a(x/b)*integral(f(t),0,b/x)

so that in Matlab it looks like (simplified):

ft=fittype('a*(x/b)^5*quad(f(t),0,b./x)',...
    'independent',{'x'},'coef',{'a','b'});

The goal being to find a and b such that the fit is in closest agreement with the data I have.

However, x is a vector, so quad won't take it as a limit.

Is there a workaround to this?

Thanks,

Grant

[Jin Ow]

Have you solved this problem?

I'm now fitting a curve defined by an integral as well, but error keeps coming out. T_T

[john zhang]

me too. Have no idea how to use integration inside fittype.