On Jan 28, 2009, at 8:26 AM, projet...@club-internet.fr wrote:

> I'm looking a solution for ploting relation like f(x;y)=0.

I usually just contour the function over the region.  E.g.,

 >>> import numpy as np
 >>> import matplotlib.pyplot as plt
 >>> x, y = mgrid[-10:10:50j, -10:10:50j]
 >>> f = x**3 * y - 3.0
 >>> contour(x, y, f, (0,))

The fourth argument to contour is a list of contours to plot, here  
only zero.

-Rob

----
Rob Hetland, Associate Professor
Dept. of Oceanography, Texas A&M University
http://pong.tamu.edu/~rob
phone: 979-458-0096, fax: 979-845-6331




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