When passing a python function to plot3d, specifying the variable
names and including 'adaptive=True' makes plot3d fail, with the
message
AttributeError: 'function' object has no attribute 'subs'
In more detail:
sage: def f(x,y): return sin(x+y)
Then the following work and produce the same graph:
plot3d(f, (x, -5, 5), (y, -5, 5))
plot3d(f, (-5, 5), (-5, 5))
On the other hand,
plot3d(f, (-5, 5), (-5, 5), adaptive=True)
works, but
plot3d(f, (x, -5, 5), (y, -5, 5), adaptive=True)
barfs with the error message given above.
Is this a bug, or is this related to one of the issues raised in this
earlier thread
<http://groups.google.com/group/sage-support/browse_frm/thread/
9ad07eeddb850ab3/e0cab1daca9b0883?lnk=gst&q=plot3d#e0cab1daca9b0883> ?
If it's not a bug, it should perhaps fail more gracefully, since the
plot works if 'adaptive=False'.
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