__Function:__int**gsl_multifit_covar***(const gsl_matrix **`J`, double`epsrel`, gsl_matrix *`covar`)-
This function uses the Jacobian matrix
`J`to compute the covariance matrix of the best-fit parameters,`covar`. The parameter`epsrel`is used to remove linear-dependent columns when`J`is rank deficient.The covariance matrix is given by,

and is computed by QR decomposition of J with column-pivoting. Any columns of @math{R} which satisfy

are considered linearly-dependent and are excluded from the covariance matrix (the corresponding rows and columns of the covariance matrix are set to zero).

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