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