Hi! I installed gsl from binary rpms on redhat 7 and Mandrake 9.1. In both case, svd on large matrices (500 x 500) didn't end after 12 hours or so. When I recompiled from source, this problem disapeared. Best regards Georges Dupret Accédez au courrier électronique de La Poste : www.laposte.net ; 3615 LAPOSTENET (0,34/mn) ; tél : 08 92 68 13 50 (0,34/mn)"