[gambit-list] Proposed patch
Bradley Lucier
lucier at math.purdue.edu
Mon Dec 9 22:28:39 EST 2013
I think we could have more discussion of proposed patches on this list,
if we like.
So here's a proposed patch for your consideration, with a real changelog
entry ;-):
lib/_num#.scm: Add (macro-inexact-+pi/4) and (macro-inexact-+3pi/4).
lib/_num.scm: Add ##flsquare, ##square, and square. Add
##exact-int.negative?
Use it in ##abs. Add functions from Kahan's paper: ##kahan.abs,
##kahan.arg,
##kahan.cssqs, ##kahan.csqrt, ##kahan.cacos, ##kahan.casin, ##kahan.casinh,
##kahan.catanh, ##kahan.ctanh, ##kahan.ctan; and constants ##kahan.omega,
##kahan.epsilon, ##kahan.lambda. Add functions ##conjugate and conjugate.
In ##log, use ##fllog1p for arguments near 1. In ##sin and ##cos, use
real trigonometric
and hyperbolic functions for complex arguments. In ##tan, use ##tanh
for complex
arguments. In ##casin, use ##kahan.casin. In ##acos, use ##kahan.acos. In
##atan, use ##atanh. In ##atan2, use Kahan's conventions for infinite
arguments.
##sinh, sinh, ##cosh, cosh, ##tanh, tanh, ##asinh, asinh, ##acosh,
acosh, ##atanh,
atanh: New functions. In ##sqrt: Use ##kahan.csqrt for complex
arguments. In
##magnitude: use ##exact-int.negative? for ratnum arguments and
##kahan.abs for
complex arguments.
lib:gambit#.scm: Add entries for acosh, asinh, atanh, conjugate, cosh,
sinh, square,
and atanh.
Marc: I'd like to have the compiler recognize ##flsquare.
I'll attach the patch. I would really appreciate any comments.
Brad
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