Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!gem.mps.ohio-state.edu!ctrsol!emory!boothe
From: boothe@mathcs.emory.edu (Ronald Boothe {guest})
Newsgroups: comp.graphics
Subject: grtool-1.02beta
Message-ID: <4682@emory.mathcs.emory.edu>
Date: 3 Dec 89 21:58:04 GMT
Reply-To: boothe@emory.UUCP (Ronald Boothe {guest})
Organization: Math and Computer Science, Emory University, Atlanta GA
Lines: 14

I just installed the 1.02beta version of grtool on my sparcbox.  It has lots
of nice features, but I discovered an error in it unless I am 
misunderstanding something.  I set up log-log axes and then transformed
my data using the built in transformation window so that x=log(x) and
y=log(y).  However, when I plot the points they do not show up in the
proper place on the graph.  Simple example, I created test.dat with
pairs 1,1; 10,10.  World coordinates are set to -1,-1 and
+2,+2.  My pairs of points do not plot at 0,0 and 1,1
By trial and error I discover that points plot (at least approximately)
correct if I transform x=log(x) + .2 and y=log(y) + .2
I am just a user, not a programmer.  Can somebody give me a correction to
the source code to fix this, or explain what I am doing wrong if it is a
misunderstanding of the documentation on my part.
Thanks,


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