[sage-devel] plot3d problem - stalled in maxima

[mikeslov]

I saw similar tickets, now closed, but the problem remains in version
3.2:

x,y=var("x y")

plot3d(x^2-y^2, (-1,1),(-1,1))

There must be something wrong in the function
sage.plot.plot3d.parametric_plot3d.adapt_to_callable

My crude fix was:

    try:
        try:
            if len(f):
                s = sum(f) # get common universe
        except TypeError:
            s=f

instead of original code at the beginning of mentioned function:

    try:
        s = sum(f) # get common universe
    ...

I know, this is probably not the right fix, but maybe, it can drive
someone with deeper knowledge of code in the right direction.

Michal

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