> There was a huge thread on sage-devel about this a while ago. I think  
> the consensus was that
>
> sage: f(x,y) = x^2+y^2-1
>
> will still create a (directly callable) symbolic function, but
>
> sage: f = x^2+y^2-1
>
> will not, as the ordering between x and y is ambiguous. The jury was  
> still out on whether
>
> sage: f = x^2+1
> sage: f(10)
>
> should work, because there is a non-ambiguous interpretation. I'd  
> also like to keep the
>
> f(x=5, y=3)
>
> shorthand for f.subs(x=5, y=3).

Sorry, wasn't intending to open that again - I meant the first thing,
but avoiding the slowness (my car is just fine, thanks).

But this whole thread was quite helpful to review the four (!)
possibilities for doing evaluation: Maxima, ns, _fast_float_, and ring
creation.  Thanks!

- kcrisman
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