Then how do I instanciate a real function of several variables as in
X = symbols('x y z',real=True)
F = Function('F')(*X)
On Sat, Sep 19, 2015 at 6:34 PM, Christophe Bal <[email protected]> wrote:
> Hello.
>
> Have you tried this ?
>
>
> *from sympy import **
>
> *class f(Function):*
> * is_real = True*
>
> *x = Symbol('x',real=True)*
>
> *df = f.diff(x)*
>
> *print(re(df))*
> *print(im(df))*
>
>
>
>
> *Christophe BAL*
> *Enseignant de mathématiques en Lycée **et développeur Python amateur*
> *---*
> *French math teacher in a "Lycée" **and **Python **amateur developer*
>
> 2015-09-20 0:22 GMT+02:00 brombo <[email protected]>:
>
>> Could you elucidate further or give me a link. I don't have a clue to
>> implement what you suggested.
>>
>> On Saturday, September 19, 2015 at 6:00:11 PM UTC-4, Aaron Meurer wrote:
>>>
>>> The only way to do it presently is to subclass Function manually:
>>>
>>> class f(Function):
>>> is_real = True
>>>
>>> Aaron Meurer
>>>
>>> On Sat, Sep 19, 2015 at 2:47 PM, brombo <[email protected]> wrote:
>>> > Your method works for a function, but not the derivative of a function
>>> -
>>> >
>>> > x = Symbol('x',real=True)
>>> >
>>> > f = RealFunction('f')(x)
>>> >
>>> > print re(f)
>>> > f
>>> > print im(f)
>>> > 0
>>> >
>>> > df = f.diff(x)
>>> > print re(df)
>>> > re(df)
>>> > print im(df)
>>> > im(df)
>>> >
>>> > What should happen is that re(df) = df and im(df) = 0, but is doesn't
>>> > happen. Any suggestions?
>>> >
>>> >
>>> >
>>> >
>>> > On Saturday, September 19, 2015 at 12:58:53 PM UTC-4, brombo wrote:
>>> >>
>>> >> How do I define a real function of a real variable?
>>> >>
>>> >> X = symbols('x y z',real=True)
>>> >>
>>> >> f = Function('f',real=True)(*X)
>>> >>
>>> >> "real=True" in Function doesn't do anything.
>>> >
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