Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!uokmax!d.cs.okstate.edu!drd!mike
From: mike@DRD.Com (Mike Rovak)
Newsgroups: comp.sys.handhelds
Subject: Re: plotting relations
Summary: TRUTH plot does it
Keywords: truth, relation, plot
Message-ID: <1990Dec13.213127.13712@DRD.Com>
Date: 13 Dec 90 21:31:27 GMT
References: <62CA96D8A0002764@gacvx2.gac.edu> <27659426:1419.1comp.sys.handhelds;1@hpcvbbs.UUCP> <2682@charon.cwi.nl>
Sender: Mike Rovak
Followup-To: comp.sys.handhelds
Organization: DRD Corporation
Lines: 28

jurjen@cwi.nl (Jurjen NE Bos) wrote:
} akcs.mitchell@hpcvbbs.UUCP (Mitchell Dickerman) writes:
} 
} >Can the 48 plot Y^X=X^Y? No, and that's the program I'm looking for.
} 
} This is quite hard; plotting relations is hard in general.  How about
} plotting F(x,y)>0 using TRUTH plot? (It takes forever, but it works)
} For example, plotting 'RE(X^Y)>RE(Y^X)' gives you a very interesting plot
} indeed (using default PPAR).

I plotted 'ABS(Y^X-X^Y)<.001' as a TRUTH plot, with X independent and
Y dependent.  I did it this way so that floating point roundoff would
not kill me.  Takes a relatively long time as you say, the power
function does not help speed things up.

I get the expected result, a pixel at (-4,-2), a pixel at (+4,+2),
and all the points along the line X=Y in the default display range.  Is
this not what was requested?

-- Mike

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