Would it be better to add a method="recursive" option to the current
subs method?
To answer your question though, I think the procedure to add anything
to Sage is to create a patch and submit it to trac. See the
Programming guide for
some hints.
On Fri, Oct 17, 2008 at 3:23 AM, Stan Schymanski <[EMAIL PROTECTED]> wrote:
>
> I wrote a function to do the above (subsg(variable), see below), but I
> would like to use it as a method notation (e.g. variable.subsg()).
> Could anyone tell me how to do this?
>
> Thanks a lot!
>
> Stan
>
> Here is the function:
>
> def subsg(variable):
> """
> Substitutes all definitions in the global name space for the
> variables contained in 'variable' and returns the result.
> INPUT:
> variable -- a symbolic variable
> EXAMPLE:
> sage: var ('a b c')
> a b c
> sage: f = a*x
> sage: a = 2*b
> sage: b = c^2
> sage: subsg(f)
> 2*c^2*x
>
> """
> expr1 = variable
> expr2 = variable.subs(globals())
> while expr1 <> expr2:
> expr1 = expr2
> expr2 = expr1.subs(globals())
> return expr1
> >
>
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