This module contains a PDL (Perl Data Language) interface to the levmar library. The levmar library contains Levenberg-Marquardt fitting routines (by Manolis Lourakis). Levmar provides a single entry point to twelve routines in the library (plus some utility routines). These routines offer: fitting with numerical or analytic jacobians; single or double precision; no constraints, or linear constraints, or box constraints. This module will build under PDL 2.4.2 as well as the current cvs version of PDL. See INSTALL for instructions on building and installing and dependencies on external libraries. In brief, you need only a standard PDL installation and lapack and blas shared libraries and headers. See ./scantree.pl in this directory for installing online pdl docs. It is modified a bit from the one supplied in PDL 2.4.2. John Lapeyre john is the username at physics dot arizona dot edu Put 'levmar' in the subject line or I will almost certainly never get it.