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I wonder what software I can use to draw curve based on data, like the origin or Excel under windows. I tried the KSpread Office tool but it is not that good I think.
Will anyone recommend one for me. Thanks a lot.
If all you want is plotting ability then gnuplot is the one for you. It's not a spreadsheet and doesn't pretend to be, but with a bit of reading it makes very nice graphs. Outputs to a variety of useful formats and can be manipulated by other code (like Perl scripts).
Like funkidan2, I suggest you to use gnuplot . However if you don't want to spend to much time reading manuals you can use xmgrace too. It's easier to use and also more intuitive ( like Excel ) than gnuplot even if it doesn't allow you to make 3D graph.
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