Thanks Evgeniy. I added a conditional to check for the GSL version, and made some tests which are now committed. On Sun, Jan 3, 2010 at 4:39 PM, Evgeniy Zhemchugov <jini.zh at gmail.com> wrote: > The gsl_cholesky_invert function was added in gsl-1.12. The attached > patch provides support for it in GSLL. Liam