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Article #72458Re: GNUPLOT: restriction on data size?
From: user name unknown
Date: Sat, 01 Feb 1992 02:24
Date: Sat, 01 Feb 1992 02:24
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In article <0dWOq0y00VpJ02hIgP@andrew.cmu.edu> gl10+@andrew.cmu.edu (Gregory A. Landrum) writes: [Referring to problems with huge data values in gnuplot] >The problem seems to go away if the maximum value is around 1e+38. 1e+38 "just happens" to be the largest representable floating point number in IEEE single precision (32 bit) floating point (and on both single and the most common double precision floating point on Vaxen). Many (most) C implementations use IEEE single to represent "float". This strongly suggests that "float" variables are being used to store things, when "double" might be more appropriate. Actually, a machine- specific typedef would probably be better, because different systems *do* vary on this. - Jonathan Thornburg University of British Columbia Astronomy and Physics, and University of Texas at Austin Physics/Relativity <jonathan@einstein.ph.utexas.edu>
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1025b4,2e72fd148fc31f71 X-Google-Attributes: gid1025b4,public X-Google-ArrivalTime: 1992-01-31 22:51:42 PST Newsgroups: gnu.misc.discuss Path: arc1-ca.pugleaf.net!sparky!uunet!morrow.stanford.edu!decwrl!csus.edu!wupost!news.utdallas.edu!hermes.chpc.utexas.edu!jonathan From: jonathan@chpc.utexas.edu (user name unknown) Subject: Re: GNUPLOT: restriction on data size? Message-ID: <1992Feb1.022443.24076@chpc.utexas.edu> Summary: 1e+38 "just happens" to be the max IEEE single (= C "float") fp number Sender: Jonathan Thornburg <jonathan@einstein.ph.utexas.edu> Organization: The University of Texas System - CHPC References: <1992Jan31.161659.6528@rice.edu> <0dWOq0y00VpJ02hIgP@andrew.cmu.edu> Date: Sat, 1 Feb 92 02:24:43 GMT Lines: 18