# [Maxima] failed tests in rtest_trig

Raymond Toy raymond.toy at ericsson.com
Mon Feb 27 11:22:15 CST 2006

>>>>> "Robert" == Robert Dodier <robert.dodier at gmail.com> writes:

>> Some of yesterday's modifications to trigi.lisp produce
>> inaccurate values for atanh for values near zero.
>> I don't think that's something we want to allow.

Robert> Well, I think it's better than being off by %pi everywhere
Robert> on (-\infty, -1) U (1, \infty).

I think I'd rather have accurate values for atanh near zero.  Until
this came up here amongst us, there was not a single report (that I
can remember) complaining that atanh had the wrong branch cuts.  That
tells me that most users don't care, but I think most users would be
annoyed if atanh near zero were not very accurate, because that's
something they can verify easily themselves.

Ray