nonlinear equations and nonlinear least squares static library

 Minpack includes software for solving nonlinear equations and
 nonlinear least squares problems. Five algorithmic paths each include
 a core subroutine and an easy-to-use driver. The algorithms proceed
 either from an analytic specification of the Jacobian matrix or
 directly from the problem functions. The paths include facilities for
 systems of equations with a banded Jacobian matrix, for least squares
 problems with a large amount of data, and for checking the consistency
 of the Jacobian matrix with the functions.
 .
 This package provides the headers, man pages, examples, and static library.