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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Closed REQ 6258]: question
> I want to plot a 3D graph (plot of pixel value in z axis, > row and column numbers in x and y axes respectively). If you have data that fit in some sort of grid  N rows, M columns, NxM data points  then it's very simple: use a MESH. If (since) the rows and columns are lined up with the x and y axes, it's even simpler. For example, here's a MESH that represents the function z(x,y) = x + y^2 as x and y go from 1 to 1, x in 5 steps, y in 3 steps. The comments, line breaks, and so on are just for readability. All you need is to separate items with blanks (no commas). MESH 5 3 # First row of 5 vertices: 1 1 0 # x y z .5 1 .5 0 1 1 .5 1 1.5 1 1 2 # another row... 1 0 1 .5 0 .5 0 0 0 .5 0 .5 1 0 1 # last row... 1 1 0 .5 1 .5 0 1 1 .5 1 1.5 1 1 2 If the data aren't arranged on some sort of rectangularlyconnected grid, but have the form of some function z(x,y) on scattered points in the xy plane, you can use scatter2graph (from ftp://ftp.geom.umn.edu/pub/software/scatter2graph.tar.Z ) to take the data and make a surface out of them that's readable by geomview. Hope this helps. Stuart Levy


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