On Sun, Oct 2, 2011 at 12:38 PM, <tlaro...@polynum.com> wrote: > Is there some documentation about the precision of the circular (i.e > trigonometric) fonctions, depending on the (plan9) implementation and > the hardware?
They are not terribly accurate. If you need accurate versions, the best I know are the ones that were written at Sun and included in the FreeBSD math library. There are copies on any FreeBSD machine and also in the vx32 distribution: http://code.swtch.com/vx32/src/tip/src/libvxc/msun. For Go, we started with implementations of the Plan 9 library algorithms but have been slowly replacing them with implementations of the Sun/FreeBSD algorithms for the improved accuracy. Russ
