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--- a/src/plugins/fits/non_linear.h
+++ b/src/plugins/fits/non_linear.h
@@ -177,7 +177,9 @@ bool kstfit_nonlinear(
}
iIterations++;
} while( iStatus == GSL_CONTINUE && iIterations < MAX_NUM_ITERATIONS );
- gsl_multifit_covar( pSolver->J, 0.0, pMatrixCovariance );
+ gsl_matrix *J = gsl_matrix_alloc (pSolver->fdf->n, pSolver->fdf->p);
+ gsl_multifit_fdfsolver_jac (pSolver, J);
+ gsl_multifit_covar (J, 0.0, pMatrixCovariance);
//
// determine the fitted values...
--- a/src/plugins/fits/non_linear_weighted.h
+++ b/src/plugins/fits/non_linear_weighted.h
@@ -193,7 +193,9 @@ bool kstfit_nonlinear_weighted(
}
while( iStatus == GSL_CONTINUE && iIterations < MAX_NUM_ITERATIONS );
- gsl_multifit_covar( pSolver->J, 0.0, pMatrixCovariance );
+ gsl_matrix *J = gsl_matrix_alloc (pSolver->fdf->n, pSolver->fdf->p);
+ gsl_multifit_fdfsolver_jac (pSolver, J);
+ gsl_multifit_covar (J, 0.0, pMatrixCovariance);
//
// determine the fitted values...
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