On Wednesday, 11 April 2012 03:11:03 UTC+10, Michael Orlitzky wrote:
>
> On 04/09/12 22:18, ancienthart wrote:
> > Hah. Thanks Michael and P. I first learnt Python in the 1.5 era, so
> > there's a few of the nice new syntax features I'm still not up to speed
> on.
> > Any reason why .subs doesn't accept multiple arguments? Would there be
> > any point in requesting .subs_expr become the new default on trac?
>
> `subs` accepts multiple arguments too, and will generally work like a
> function call with named arguments if you want it to.
>
> sage: x,y,z = var('x,y,z')
> sage: f = x + y + z
> sage: f(x=1, y=2, z=3)
> 6
> sage: f.subs(x=1, y=2, z=3)
> 6
> sage: f.subs({x: 1, y: 2, z: 3})
> 6
>
> Passing it one equation does work,
>
> sage: f.subs(x == 1)
> y + z + 1
>
> But more than one doesn't,
>
> sage: f.subs(x == 1, y == 2)
> ...
> TypeError: substitute() takes at most 1 positional argument (2 given)
>
> I guess all that's missing is the ability to pass it multiple equations,
> like `subs_expr`. It would probably be easy to add that ability to
> `subs` if you want to create a ticket for something.
>
Done. http://trac.sagemath.org/sage_trac/ticket/12834
Joal Heagney
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