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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