On Tue, Aug 5, 2008 at 6:27 AM, Alex Raichev <[EMAIL PROTECTED]> wrote:
>
> Hi all:
>
> I am having difficulty differentiating a formal symbolic function
> multiplied by the symbolic constant 1 (see code below). Is this a
> bug? How can i work around it?
>
> Alex
> =======================================
> sage:
> var('x')
> f= function('F',x)
> g= x^2
> a= SR(2)
> b= SR(1)
> for j in [f,f*g,f*a,g*b]:
> print type(j)
> print diff(j,x)
>
> <class 'sage.calculus.calculus.SymbolicFunctionEvaluation'>
>
> d
> -- (F(x))
> dx
> <class 'sage.calculus.calculus.SymbolicArithmetic'>
>
> 2 d
> x (-- (F(x))) + 2 x F(x)
> dx
> <class 'sage.calculus.calculus.SymbolicArithmetic'>
>
> d
> 2 (-- (F(x)))
> dx
> <class 'sage.calculus.calculus.SymbolicArithmetic'>
> Traceback (most recent call last): print diff(j,x)
> File "/home/arai021/sage-3.0.2-ubuntu32-intel-i686-Linux/local/lib/
> python2.5/site-packages/sympy/plotting/", line 3, in <module>
^^^ why is sympy called here?
That's another bug that should be imho fixed, sympy should not be
called unless needed.
Ondrej
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