How to solve this equation which contains gamma function?

When r_21 = 1.7591, r_31 = 2.4062, I want to get parameters n and τ.

How can I solve this equations using matlab?

'solve' cannot have the 'gammainc' function (which means incomplete gamma function) so it can be alternated as follows;

Γ(a,z) = exp[gammaln(a)] * [1-gamcdf(z,a)]

please help me, I appreciate you.

Answer 1

[Roger Stafford]

I would advise you to use 'fsolve' which is a numerical solver rather than the symbolic solver 'solve'. You are more likely to obtain a solution that way.