Thanks for clearing up my confusion. I will try to implement this. I
have added it as ticket #825.
Marshall
On Oct 4, 11:48 am, "William Stein" <[EMAIL PROTECTED]> wrote:
> On 10/4/07, Hamptonio <[EMAIL PROTECTED]> wrote:
>
>
>
> > I am porting some Mathematica code to sage and I ran into a minor
> > issue. I was using the Mod command in mathematica with argument types
> > Mod[float,integer] to create a periodic function. In sage, the mod
> > command gives an error on that sort of input. So I made a simple
> > function:
>
> > def float_mod(x,divisor):
> > '''An extension of the mod command for floats.'''
> > return x-floor(float(x)/divisor)*divisor
>
> > which does what I want. Is there something like this already in
> > sage?
>
> Yes, %, e.g.,
>
> sage: a = float(1.2393); b = int(5)
> sage: a % b
> 1.2393000000000001
> sage: a = float(1.2393); b = int(1)
> sage: a % b
> 0.23930000000000007
>
> That this doesn't work on Sage types, i.e., Sage real numbers
> and Sage integers is because we didn't think to implement it:
>
> sage: 1.2394 % 1
>
> boom because we didn't think to implement.
>
> Should this be added to Sage? If somebody thinks so...
> implement it and post a trac ticket.
>
> > I know the normal python % operation does something similar but
> > that's taken out by the preparser.
>
> The Sage preparser doesn't touch %:
>
> sage: preparse('a % b')
> 'a % b'
>
> William
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