At Fri, 18 Jul 2008 12:14:10 +0100, Jonny Taylor wrote: > The following is sufficient to demonstrate the issue. > double besselArray[51]; > double rho = 1e-6; > gsl_sf_bessel_Jn_array(0, 50, rho, besselArray); > > The problem is that the array is populated by downward recurrence, but > J_51 and J_50 are way smaller than DBL_MIN, resulting in an error > within the GSL library: > gsl: gamma.c:1454: ERROR: underflow > Default GSL error handler invoked.
I looked at the code and there's no easy way to add support for scaling the results in GSL itself at the moment. I would recommend that you make an estimate of n_max using the asymptotic formula for Jn. -- Brian Gough GNU Scientific Library - http://www.gnu.org/software/gsl/ _______________________________________________ Help-gsl mailing list Help-gsl@gnu.org http://lists.gnu.org/mailman/listinfo/help-gsl
