This is fixed in the upcoming beta5. Maybe you better search trac before posting about already fixed bugs.
sage: gegenbauer(2,1,1.) 3.00000000000000 sage: gegenbauer(2,1,2.) 15.0000000000000 sage: gegenbauer(2,1,0.) -1.00000000000000 On Thursday, June 23, 2016 at 1:39:43 AM UTC+2, Paul Masson wrote: > > This series of values is correct for integer arguments: > > > sage: gegenbauer(2,1,x) > > 4*x^2 - 1 > > sage: gegenbauer(2,1,0) > > -1 > > sage: gegenbauer(2,1,1) > > 3 > > sage: gegenbauer(2,1,2) > > 15 > > > But nonzero floats give wrong answers: > > > sage: gegenbauer(2,1,1.) > > 0.500000000000000 > > sage: gegenbauer(2,1,2.) > > 0.875000000000000 > > And even worse, gegenbauer(2,1,0.) gives the error: > > OverflowError: numeric::inverse(): division by zero > > > Ralf? > > > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
