On Thursday, 26 September 2013 17:13:28 UTC-3, Nils Bruin wrote:
<...>
> The problem is that subs expects the keys for its dictionary to be
> symbolic variables, not strings. If you do
>
> sage: P2={SR(k):v for k,v in params.iteritems()}
> sage: (sols[0][0].rhs()).subs(P2)
>
> it should work. As you found, unpacking into keyword arguments using **
> works too if all your keys are strings.
>
> Since x.subs({'x': 1}) will never work, we could pre-process the
> dictionary, calling SR(s) on any string keys. That would add more magic,
> though, which would go badly with the .subs methods on, say, polynomial
> rings etc.
>
>
Great info! I am affraid I am at the start of the learning curve with sage.
I guess all will start to fall into place once I get more familiar with
sage's types
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