I don't know. I think Paul Butler wrote that function. Maybe he knows?
On Wed, Dec 9, 2009 at 9:20 AM, Philippe Saade <psa...@gmail.com> wrote:
> Hello Folks,
>
> This works ==========
>
> var('x')
> f1(x) = 2
> f2(x) = 4-x
> f3(x) = exp(x)/10
> f4(x) = sin(2*x)
> f = Piecewise([[(0,1),f1],[(1,2),f2],[(2,3),f3],[(3,10),f4]])
> F = f.integral()
> F.plot()
>
> This does not (f1 changed, nothing else) ================
>
> var('x')
> f1(x) = 1
> f2(x) = 4-x
> f3(x) = exp(x)/10
> f4(x) = sin(2*x)
> f = Piecewise([[(0,1),f1],[(1,2),f2],[(2,3),f3],[(3,10),f4]])
> F = f.integral()
> F.plot()
>
> the error is :
> Traceback (click to the left for traceback)
> ...
> ValueError: free variable: x |--> x
>
> Any idea why this happened ?
>
> Thanks (very much) for any advice or comment.
>
> Philippe Saadé
>
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