Looking for faster ways to make chi^2 nonlinear fit calculations, for functions involving integrals, I have compared timings of calculation of chi^2 at a pair of sample points evaluating the integrals by three numerical methods. In the attached worksheet they are called as follows: 1. chin, using evalf(Int(...)) 2. chin2, using the interpolant option (`dsolve/numeric`(sys, range=...)) 3. chin3, using evalf(Int(...,method=_d01ajc)) I have obtained timings with Maple 9.5 using first a Celeron 333 MHz under RH7.1 and then a P4 1.8 GHz under Win XP. My expectation was that the method of the interpolant function were the

Is it possible to generate C or Fortran code for a numerically evaluated integral (ie. evalf(Int(...)) )? with(CodeGeneration): and either C(..) or Fortran(...) yield the error message: Warning, the function names {Int} are not recognized in the target language (a similar error message occurs for an int(..) expression) Alejandro