Re: [math-fun] floating point precision and hyperbolic functions

* Mike Speciner <ms@alum.mit.edu> [Aug 03. 2008 21:08]:

Thanks for the pointer. I see that these functions are now called expm1 and log1p, and are available in many (but sadly not all) math libraries and languages, and people know enough to complain when they're not present. Were I still writing PostScript clones, I'd make sure to include them, even though it wouldn't be quite Adobe compatible.

--ms

[...]

Seems at least ISO C99 (and new versions of XOPEN) require that: from the man pages: expm1(), expm1f(), expm1l(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99 very same for log1p()