[SciPy-user] (numerical) "solving" 2-dimensional equations ?

[Stef Mientki]

hello all,

I'm trying to build a graphical calculator,
for time-series and (simple) 2-dimensional equations.

Now my math has become very rusty,
and I think it shouldn't be too difficult,
but I can't find the right clue (or isn't the problem so simple) ?

The idea is that the user, types in the equation, specifies the range of 
one of the axis,
then the program draws the picture of that equation in the specified range.
i.e for a circle
        sqr (x) + sqr (y) = 4
        x = linspace ( -10, 10, 1000 )

Who can give me some clues ?

thanks,
Stef Mientki