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59

answers:

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I had a short look at some popular plotting libraries but haven't found what I need until now.

Basically I'm looking for a library or tool that generates a graph as it is known from school. That means not an axis description at the outer left and one at the bottom, but two crossed axes, mostly positioned in the center of the graph. You can find an example here.

Maybe I didn't notice that gnuplot/octave/matplotlib or any others already have that feature. If so, I'd like to get a clue where to find the information.

A: 

I'm sure this is not the perfect solution, but you can perhaps plot 4 hidden points:

pt1: (-100, 0)
pt2: ( 100, 0)
PT3: ( 0, -100)
pt4: ( 0, 100)

"100" would represent the extents of your graph. On another note, some graph libraries enable quadrant views, so you might have to set it up to view all 4 quadrants.

A short google search yielded this java script tool

dassouki