diff options
| author | Jeff Johnston <jjohnstn@redhat.com> | 2010-10-19 02:40:24 +0400 |
|---|---|---|
| committer | Jeff Johnston <jjohnstn@redhat.com> | 2010-10-19 02:40:24 +0400 |
| commit | bf5300eaee04b5e143dea58e922bc6ae260197dd (patch) | |
| tree | 2d9aa73897ac0abb39e90a468babdf937e2ba513 /newlib/libm/complex/cproj.c | |
| parent | cf9e79ca7a5adbc3d6d868ce2334ddd518cda418 (diff) | |
2010-10-18 Marco Atzeri <marco_atzeri@yahoo.it>
* libm/Makefile.am: added complex functions documentation
* libm/libm.texinfo: ditto
* libm/complex/Makefile.am: Ditto
* libm/complex/complex.tex: Ditto
* libm/complex/(cabs.c, cacos.c, cacosh.c, carg.c,
casin.c, casinh.c, catan.c, catanh.c, ccos.c, ccosh.c,
cexp.c, cimag.c, clog.c, conj.c, cpow.c, cproj.c, creal.c,
csin.c, csinh.c, csqrt.c, ctan.c, ctanh.c): Ditto
* libm/Makefile.in: Regenerate
* libm/complex/Makefile.in: Ditto
Diffstat (limited to 'newlib/libm/complex/cproj.c')
| -rw-r--r-- | newlib/libm/complex/cproj.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/newlib/libm/complex/cproj.c b/newlib/libm/complex/cproj.c index e46742e9e..42fc0f1e8 100644 --- a/newlib/libm/complex/cproj.c +++ b/newlib/libm/complex/cproj.c @@ -29,6 +29,45 @@ * Marco Atzeri <marco_atzeri@yahoo.it> */ +/* +FUNCTION + <<cproj>>, <<cprojf>>--- Riemann sphere projection + +INDEX + cproj +INDEX + cprojf + +ANSI_SYNOPSIS + #include <complex.h> + double complex cproj(double complex <[z]>); + float complex cprojf(float complex <[z]>); + + +DESCRIPTION + These functions compute a projection of <[z]> onto the Riemann + sphere: <[z]> projects to <[z]> except that all complex infinities + (even those with one infinite part and one NaN part) project + to positive infinity on the real axis. If <[z]> has an infinite part, + then <<cproj>>(<[z]>) is equivalent to + + INFINITY + I * copysign(0.0, cimag(z)) + + <<cprojf>> is identical to <<cproj>>, except that it performs + its calculations on <<floats complex>>. + +RETURNS + The cproj functions return the value of the projection onto + the Riemann sphere. + +PORTABILITY + <<cproj>> and <<cprojf>> are ISO C99 + +QUICKREF + <<cproj>> and <<cprojf>> are ISO C99 + +*/ + #include <sys/cdefs.h> /*__RCSID("$NetBSD: cproj.c,v 1.3 2010/09/20 17:51:38 christos Exp $"); */ |