In 4.2.1.alpha0:
sage: f(x,y)=ln(x)
sage: P=plot3d(f,(x,0,1),(y,0,1))
sage: P
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (16, 0))
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
<snip a lot>
ValueError: math domain error
Switch to (x,0.1,1), and all is well. I am pretty sure the problem is
that line 404 in plot/plot3d/parametric_surface.pyx doesn't have an
exception handler for log(0) or other such nan type values:
sage: math.log(0)
<snip>
ValueError: math domain error
But in the plotting context, it's silly not to just ignore this; we
check for things like this all the time:
sage: plot(log,0,1)
<works fine>
Unfortunately, I don't know enough about C/Cython to fix this. For
now it would probably be enough to fix it for the z variable. This is
now #7423. Any takers, or hints as to how to fix this? Thanks!
- kcrisman
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