On May 19, 1:15 pm, P Purkayastha <ppu...@gmail.com> wrote:
> 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.
So, are you saying that this is a check which should be performed, at
least to provide a more helpful error message? We do have a bug days
coming up - not that there isn't already enough work to do there :)
but the more the merrier.
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