Thanks Didier -- all excellent choices.
-- William
On 2/13/07, didier deshommes <[EMAIL PROTECTED]> wrote:
>
>
> Hi,
> Here are 2 examples in ZZ that don't work nicely when the range is
> invalid in random_element():
> {{{
> sage: ZZ.random_element(9,-9) # not a valid range
> 11
> sage: ZZ.random_element(9,9) # single element, crashes SAGE
> ------------------------------------------------------------
> Unhandled SIGFPE: An unhandled floating point exception occured in
> SAGE.
> This probably occured because a *compiled* component
> of SAGE has a bug in it (typically accessing invalid memory)
> [...]
> }}}
>
> I modified ZZ's random_element() method so that it raises a ValueError
> when situations like the above occur.
>
> I also gave RR its own random_element() method (it looks like it was
> relyin on a generic one). It now that it mimics RDF.random_element():
> {{{
> sage: RDF.random_element(20)
> 5.648453007
> sage: RR.random_element(20)
> 15.3961818555746
>
> sage: RDF.random_element(20,30)
> 24.0967819625
> sage: RR.random_element(20,30)
> 25.3797634155821
> }}}
>
> Here is the complete patch:
>
> http://sage.math.washington.edu/home/dfdeshom/custom/patches/random_element-improv.txt
>
>
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
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