I know multiplication is very finicky. You might try using
R.<t> = PolynomialRing(RR, "t") instead, but I'm not sure that will work either.
Can you post more of your code so I can give a more detailed answer?
On Thu, Jun 25, 2009 at 2:17 PM, David Sevilla<sevil...@gmail.com> wrote:
>
> Hi,
>
> I am trying to construct the usual spline basis functions. In short, I
> start with several piecewise functions that take values 1 and 0 only,
> and then make combinations of them. But there is something with the
> syntax that I am not managing to do well, I suppose:
>
> L[1]
> Piecewise defined function with 3 parts, [[(-1, 0), 0], [(0,
> 1.50000000000000), 0], [(1.50000000000000, 3.20000000000000), 1]]
>
> t = var('t')
> L[1]*t
> Traceback (click to the left for traceback)
> ...
> AttributeError: 'sage.symbolic.expression.Expression' object has no
> attribute 'domain'
>
> It seems to me that I have to set things up so that L[1] is a function
> of t as well. I tried "lambda t: " in front where I define it, but now
> L[1] is a function whose value is always a certain piecewise
> function :)
>
> Any suggestions?
>
> Thanks,
>
> David
>
> >
>
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