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From: mcgrant@elaine3.stanford.edu (Michael Grant)
Newsgroups: comp.sys.handhelds
Subject: Re: plotting relations
Message-ID: <1990Dec14.202128.509@portia.Stanford.EDU>
Date: 14 Dec 90 20:21:28 GMT
References: <62CA96D8A0002764@gacvx2.gac.edu> <1990Dec12.145929.2298@DRD.Com> <27678177:1419.3comp.sys.handhelds;1@hpcvbbs.UUCP>
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In article <27678177:1419.3comp.sys.handhelds;1@hpcvbbs.UUCP> akcs.mitchell@hpcvbbs.UUCP (Mitchell Dickerman) writes:
>When I initially tried the TRUTH plot, it didn't due much, as not many
>pixels satisfied 'Y^X=X^Y'. Then I tried 'Y^X-X^Y<.1', which worked,
>but not very well. I gave up after that, but just last night I realized
>that if I plot 'Y^X-X^Y<=0', the outline of the shaded in areas is
>the plot I'm looking for! I.e. those pixels are the nearest ones to
>the solution. Now, how do I turn on just those pixels bordering the
>shaded in areas and then turn off the shaded areas?

Well, you could try ABS(Y^X-X^Y)<EPSILON, where epsilon is some small
number that you sorta grabeed out of the air.

If you pick epsilon too small, it will in some places be less than
1/2 a pixel, so some points won't plot; if you make it too thick,
then there will be a thick band defining the function.

Mike