Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!ames!ucsd!nprdc!malloy
From: malloy@nprdc.arpa (Sean Malloy)
Newsgroups: comp.graphics
Subject: Re: Pixar's noise function
Keywords: random numbers, Byte, elephants
Message-ID: <1796@skinner.nprdc.arpa>
Date: 23 Apr 89 19:25:21 GMT
References: <2553@ssc-vax.UUCP> <3599@pixar.UUCP> <97699@sun.Eng.Sun.COM> <1592@ccncsu.ColoState.EDU> <43327@tut.cis.ohio-state.edu> <1648@ccncsu.ColoState.EDU> <1771@skinner.nprdc.arpa> <1669@ccncsu.ColoState.EDU> <465@celia.UUCP>
Reply-To: malloy@nprdc.arpa (Sean Malloy)
Organization: Navy Personnel R&D Center, San Diego
Lines: 27

In article <465@celia.UUCP> celia!peter@tis.llnl.gov (Peter Farson) writes:
>	How about:
>
>int floor(x)
>double x;
>{
>if (x >= 0.0) return(trunc(x));
>    else return(trunc(x-.999999));
>    }
>

Looking back at my original (and slightly broken) solution, the
corrected function would be:

int floor(x)
double x;
{
  if ((x >= 0.0)||(x == trunc(x)) return(trunc(x));
      else return(trunc(x)+1);
}


 Sean Malloy					| "The proton absorbs a photon
 Navy Personnel Research & Development Center	| and emits two morons, a
 San Diego, CA 92152-6800			| lepton, a boson, and a
 malloy@nprdc.navy.mil				| boson's mate. Why did I ever
						| take high-energy physics?"