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                        patch: inverse of a matrix and Levenberg-Marquardt non linear least squares fitting
Migrated from SF: https://sourceforge.net/p/blitz/patches/5/
Contains a small function that calculates the inverse of a matrix, and in implementation of the Levenberg-Marquardt non linear least squares fitting method.
It is a very preliminary version, as it doesn't even contain error checking, so feedback from users will be very much appreciated
Carlos