Re: [Gretl-devel] c code question

Thank you, Allin Also, does it contain elementary functions in complex argument e.g. exp(), log(), etc as in libc? I can't tell on the future, what I want to do now is to make gradient and Hessian for real functions of real arguments with imaginary steps inside: e.g. for gradient: Im(f(x+i*delta_x)-f(x))/delata_x It is very exact, but very slow if it is not coded in c Due to the nature of complex numbers delta_x = $macheps for any real x The precision does not depends on x That's why it is so exact