It is not F[0] it is F(0). :-) The example cited is definitely a bug,
perhaps from sage. Note the following:
sage: M = matrix(F, [[1],[0]])
sage: type(M)
<type 'sage.matrix.matrix_mod2e_dense.Matrix_mod2e_dense'>
sage: M
<repr(<sage.matrix.matrix_mod2e_dense.Matrix_mod2e_dense at 0x7fbcf6f65e20>)
failed: OverflowError: cannot convert float infinity to integer>
So, sage doesn't even realize that the underlying library m4rie(?) crashed.
For larger powers, sage uses some other library (what?). Maybe we should
switch to that from 2^16 onwards
sage: F = GF(2**17, 'a')
sage: M = matrix(F, [[1],[0]])
sage: type(M)
<type 'sage.matrix.matrix_generic_dense.Matrix_generic_dense'>
On Saturday, September 20, 2014 3:07:27 AM UTC+8, vdelecroix wrote:
>
> There is definitely something wrong, but what would you expect from the
> command
>
> sage: F[0]
>
> Vincent
>
> 2014-09-19 6:25 UTC+02:00, Michiel Kosters <[email protected] <javascript:>>:
>
> > I have a similar bug with the following code:
> >
> > n=16
> > F.<a>=GF(2^n)
> > print Matrix([a]), F(0)
> > print Matrix([F(0)])
> >
> > The last print statement gives an error OverflowError: cannot convert
> float
> >
> > infinity to integer
> > For other n, the code does not give an error.
> >
> > Yours,
> > Michiel
> >
> >
> >
> > On Tuesday, July 8, 2014 10:21:06 PM UTC+8, David Hoo wrote:
> >>
> >> I happened to meet a overflow error, I install sage 6.2 both on a
> 64-bit
> >> macbook running MacOS 10.9 and 32-bit Dell Desktop running Ubuntu
> 12.04.
> >>
> >> The error message goes like this:
> >>
> >> OverflowError Traceback (most recent call
> >> last)
> >>
> >> <ipython-input-7-8d411648858e> in <module>()
> >>
> >> ----> 1 get_ipython().magic(u'runfile DataCollecctionScript.py')
> >>
> >>
> >>
> >>
> >>
> /Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site-packages/IPython/core/interactiveshell.pyc
>
>
> >>
> >> in magic(self, arg_s)
> >>
> >> * 2163* magic_name, _, magic_arg_s = arg_s.partition(' ')
> >>
> >> * 2164* magic_name = magic_name.lstrip(prefilter.ESC_MAGIC)
> >>
> >> -> 2165 return self.run_line_magic(magic_name, magic_arg_s)
> >>
> >> * 2166*
> >>
> >> * 2167*
> >>
> #-------------------------------------------------------------------------
> >>
> >>
> >>
> >>
> >>
> /Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site-packages/IPython/core/interactiveshell.pyc
>
>
> >>
> >> in run_line_magic(self, magic_name, line)
> >>
> >> * 2084* kwargs['local_ns'] =
> >> sys._getframe(stack_depth).
> >> f_locals
> >>
> >> * 2085* with self.builtin_trap:
> >>
> >> -> 2086 result = fn(*args,**kwargs)
> >>
> >> * 2087* return result
> >>
> >> * 2088*
> >>
> >>
> >>
> >>
> >>
> /Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/repl/ipython_extension.pyc
>
>
> >>
> >> in runfile(self, s)
> >>
> >>
> >>
> >>
> >>
> /Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site-packages/IPython/core/magic.pyc
>
>
> >>
> >> in <lambda>(f, *a, **k)
> >>
> >> * 189* # but it's overkill for just that one bit of state.
> >>
> >> * 190* def magic_deco(arg):
> >>
> >> --> 191 call = lambda f, *a, **k: f(*a, **k)
> >>
> >> *<span style="font-size:14.0pt; font-family:"*
> >> ...
> >
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