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Article #2022Re: Fast way to evaluate an exponential
From: Jerry Penner
Date: Sun, 09 Jun 1991 08:26
Date: Sun, 09 Jun 1991 08:26
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1146 bytes
In article <1991Jun9.071214.2073@noose.ecn.purdue.edu> muttiah@stable.ecn.purdue.edu (Ranjan S Muttiah) writes: > >Is there a fast way to evaluate e^-x (using table look ups) than having to >use exp(.) in c ? I have to call the exponential many times and looking for >ways to save time. Yes, use CORDIC algorithms. These beasties usually use fixed point arithmetic. A recent issue of Dr. Dobbs Journal (hopefully available at your library) gives a description and source code. They don't use table lookups but are fast. -- Jerry Penner | jpenne@bode.ee.ualberta.ca Edmonton, Alberta, Canada | OR alberta!bode!jpenne
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!spool.mu.edu!mips!atha!aunro!alberta!edson!news From: jpenne@ee.ualberta.ca (Jerry Penner) Newsgroups: comp.dsp Subject: Re: Fast way to evaluate an exponential Message-ID: <1991Jun9.082640.26871@ee.ualberta.ca> Date: 9 Jun 91 08:26:40 GMT Article-I.D.: ee.1991Jun9.082640.26871 References: <1991Jun9.071214.2073@noose.ecn.purdue.edu> Sender: news@ee.ualberta.ca Organization: University of Alberta Electrical Engineering Lines: 13