So i have been programming using visual studio 2019 c and specifically using the library gsl . I am doing a nonlinear least squares fitting. There are different examples on the official gsl website. https://www.gnu.org/software/gsl/doc/html/nls.html#testing-for-convergence
So i worked on that but everytime that i debug , i get this result with only one jacobi evaluation (NJEV) which i don't get if the issue is with how i coded the jacobi matrix or if it's because there is only 1 number of iteration (NITER) which i know how to fix.
Nonlinear Least squares fit but with only 1 NITER and NJEV
i also looked up Jacobi evaluation online but cannot find anything useful. any help is appreciated. Thank you so much.