On Saturday, May 19, 2012 7:35:08 PM UTC+8, Andrzej Giniewicz wrote:
>
> Today one of friends I introduced to Sage noticed that
> cylindrical_plot3d does not check for it's argument like plot3d does.
> It was a result of "common beginner mistake", i.e. forgetting to
> specify "return" in function. While
>
> var("x,y")
> def f(x,y):
> 1
> plot3d(f,(x,-1,1),(y,-1,1))
>
> says "TypeError: a float is required", doing
>
> cylindrical_plot3d(f,(x,-1,1),(y,-1,1))
>
> results in "RuntimeError: Segmentation fault". Wanted to ask if anyone
> can confirm this before I open ticket on trac, as like with any
> segfault I'm not sure if this is related to my build of Sage or it is
> general problem. This was checked in (almost) Sage 5.0 on x86_64
> (although I have 3 packages patched from 12760, 12761 and 12762 and
> external GCC/ATLAS - due to decisions of package manager on my
> distribution).
>
> Cheers,
> Andrzej.
Although it looks like a bug, in both cases the error stems from
sage/plot/plot3d/parametric_surface.c (actually via the cython file
parametric_surface.pyx). So, there are no checks being performed at all.
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