Abstract
This paper presents a Fortran 77 computer program of nonlinear least squares and a help on how to use the program. The codes are given. It is very easy to use. The user has to specify the function to be fitted to data and name the data file. It has been tested on the NIST, USA data. It has been successful to fit functions to the data posed as challenge problems by the CPC-X Software. The link to download the program in directly useable form (txt format) has also been given.
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