Date: Sat, 15 Sep 2012 23:42:16 -0500 From: Stephen Montgomery-Smith <stephen@missouri.edu> To: freebsd-numerics@freebsd.org Subject: Re: Complex arg-trig functions Message-ID: <505558A8.6040600@missouri.edu> In-Reply-To: <50553424.2080902@missouri.edu> References: <5017111E.6060003@missouri.edu> <50295F5C.6010800@missouri.edu> <20120814072946.S5260@besplex.bde.org> <50297CA5.5010900@missouri.edu> <50297E43.7090309@missouri.edu> <20120814201105.T934@besplex.bde.org> <502A780B.2010106@missouri.edu> <20120815223631.N1751@besplex.bde.org> <502C0CF8.8040003@missouri.edu> <20120906221028.O1542@besplex.bde.org> <5048D00B.8010401@missouri.edu> <504D3CCD.2050006@missouri.edu> <504FF726.9060001@missouri.edu> <20120912191556.F1078@besplex.bde.org> <20120912225847.J1771@besplex.bde.org> <50511B40.3070009@missouri.edu> <20120913204808.T1964@besplex.bde.org> <5051F59C.6000603@missouri.edu> <20120914014208.I2862@besplex.bde.org> <50526050.2070303@missouri.edu> <20120914212403.H1983@besplex.bde.org> <50538E28.6050400@missouri.edu> <20120915231032.C2669@besplex.bde.org> <50548E15.3010405@missouri.edu> <5054C027.2040008@missouri.edu> <5054C200.7090307@missouri.edu> <20120916041132.D6344@besplex.bde.org> <50553424.2080902@missouri.edu>
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Hey guys - I have a piece of code like this:
if (ax < DBL_EPSILON && ay < DBL_EPSILON)
if ((int)ax==0 && (int)ay==0) { /* raise inexact */
if (sy == 0)
return (cpack(m_pi_2 - x, copysign(ay, -1)));
return (cpack(m_pi_2 - x, ay));
}
Is there a good reason I didn't code it like this?
if (ax < DBL_EPSILON && ay < DBL_EPSILON)
if ((int)ax==0 && (int)ay==0) /* raise inexact */
return (cpack(m_pi_2 - x, -y));
I'm trying to remember if I coded it the second way, and one of you told
me to code it the first way. Or maybe I came up with the first way
myself - maybe I wasn't sure what would happen if y was 0 or -0.
Thanks, Stephen
help
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