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MathGroup Archive 2008

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Get Graphics Coordinates accuracy

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92261] Get Graphics Coordinates accuracy
  • From: John Jowett <John.M.Jowett at gmail.com>
  • Date: Thu, 25 Sep 2008 05:30:44 -0400 (EDT)

I came across a limitation in the mechanism for copying coordinates of
points in 2D graphics (the Get Coordinates button in the Drawing Tools
palette) in V6.03.

Consider the following plot of a sine wave

Plot[Sin[2 x], {x, 20270, 20275}]

When I try to select and paste the coordinates of the two crests of
the wave, I typically get two points with the same x-coordinate

{{2.027*^4, 0.99}, {2.027*^4, 0.99}}

whereas I would expect the two x-coordinates to be around
20270.3 and 20273.5, values which are well separated on the plot.

This seems to happen because the Get Coordinates function only returns
the first 4 digits of the coordinates.

Does anyone know of a way to fix this ?  Obviously, in this
demonstration example, I could change variables to x1=x-20270 but in
the more complicated problem I am working on, this is not so easy.

John Jowett


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