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From: rouil@ada-uts.UUCP
Newsgroups: net.graphics
Subject: Scaling graphs
Message-ID: <14200002@ada-uts>
Date: Fri, 11-Jul-86 17:15:00 EDT
Article-I.D.: ada-uts.14200002
Posted: Fri Jul 11 17:15:00 1986
Date-Received: Mon, 14-Jul-86 07:31:01 EDT
Lines: 29
Nf-ID: #N:ada-uts:14200002:000:1136
Nf-From: ada-uts!rouil    Jul 11 17:15:00 1986


   I will be working on a tool, for a research computer, that will
generate a scale for plotting data points given a data set of several
thousand points.

   The easiest way to generate a linear scale for both the X and Y axes is
to take the differences of the min and max then divide by the size of the
axis to determine the distence/unit.  Then to plot the points it is a
simple mapping of w plotter distance being equal to z scale distance.

   However I also need a method of generating logarithmic scales for the
data.  Does anybody know a good way of generating a logarithmic scale
from a set of points.

   Once you have the logarithmic scale how do you map betwen the scale
distance and the plotter distance.

   This program will be written in DEC fortran on a VAX.  If there is
public domain code out there please let me know about it.

   I would prefer that you mail responses to me.  If there is interest in
the answers I will post to the net.

                                          Thanks,

John Rouillard                          UUCP:ihnp4!inmet!ada-uts!rouil
Intermetrics Inc.
733 Concord Ave.
Cambridge, Ma. 02138