Re: CCL:sofwares for non-linear fitting!!



>     What are the best softwares (free and for UNIX) to do non-linear
 > fitting for a very large amount of data?
 Hello, non-linear fitting is a quite huge topic from fitting simple
 nonlinear functions to neural-net based stuff. If you have too many
 points, be aware of the robustness of the procedure. In short if you have
 too many points at some part of the data, that will be overrepresented
 biasing the final parameter estimates.  Softwares you can try:
 http://www.octave.org/
 "GNU Octave is a high-level language, primarily intended for numerical
 computations. It provides a convenient command line interface for solving
 linear and nonlinear problems numerically, and for performing other
 numerical experiments using a language that is mostly compatible with
 Matlab."
 http://plasma-gate.weizmann.ac.il/Grace/
 "Grace is a WYSIWYG 2D plotting tool for the X Window System and M*tif.
 Grace runs on practically any version of Unix-like OS. " (it also has
 curve fitting capabilities)
 http://www.gnuplot.info/
 Gnuplot itself can do some nonlinear fitting, type "help fit" in its
 command prompt.
 Hope it helps:
 Szilva