> I have a real symmetric matrix and use gsl_eigen_symm to compute the > eigenvalues. After that I need to sort the eigenvalues, but I find in the > manual gsl_eigen_symmv_sort, which sorts the eigenvalues as well as the > eigenvectors. I just need to sort the eigenvalues. What function should I > use?
Does gsl_sort_vector accomplish what you need? http://www.gnu.org/software/gsl/manual/html_node/Sorting-vectors.html - Rhys