lmfit

C library for Levenberg-Marquardt nonlinear least-squares fitting

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C library for Levenberg-Marquardt minimization and least-squares fitting

lmfit

Fit data to a Gaussian function and display results$ lmfit < data.txt

Perform curve fitting with custom parameters and output to file$ lmfit -p params.txt -o results.txt data.txt

Display help information and available fitting models$ lmfit --help