Thanks Ondrej,
Yes, "Pow" function is all right.
To my problem, "pow" is converted to "Pow".
However it is tentative solution and I hope
"pow" should be treated formally.
czbebe
On 12月8日, 午後1:49, Ondrej Certik <ond...@certik.cz> wrote:
> 2009/12/7 czbebe <o...@bpe.es.osaka-u.ac.jp>:
>
>
>
>
>
> > Thanks Ondrej,
>
> >>I strongly suggest not to use this string syntax
>
> > I am sorry, but I want to get the derivatives of general equation
> > including some functions, exp, sin/cos/tan, and pow and so on.
> > It is given by a string variable.
>
> > import sympy
> > x = sympy.symbols('x')
> > f = pow(x,2)
> > g = sympy.diff(f,x)
> > print g
>
> > This gives 2*x and is correct, but f = pow(x,2) seems questionable.
> > You said "no "pow" function in sympy", but g1= sympy.diff(pow(x,2),x)
> > gives correct result 2*x. Why ?
>
> Ronan answered this above (pow is a builtin function and sympify
> should be improved to use that).
>
>
>
> > Pow function is critical for me because my mathml converter gives
> > pow functions even if simple x**2 is converted to pow(x,2).
>
> You can always substitute pow to Pow in your mathml converter and then
> use sympify, that should work. Better solution is to fix sympify to
> handle pow as well.
>
> Ondrej- 引用テキストを表示しない -
>
> - 引用テキストを表示 -
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