** is implemented as the Pow object in sympy/core/pow.py. So if you
do a**b, this is the same as calling Pow(a, b).
a - b is actually implemented as Add(a, Mul(-1, b)) (these are in
sympy/core/add.py and sympy/core/mul.py). Similarly, a/b is
implemented as Mul(a, Pow(b, -1)).
Does that answer your question? The actual derivative computation
happens in places like Add._eval_derivative.
Aaron Meurer
On Mon, Feb 13, 2012 at 3:29 AM, Alberto Barbaro
<barbaro.albe...@gmail.com> wrote:
> Many thanks Aaron. Now i'm trying to understand the code and understand the
> flow.
>
> I have a simple question:
>
> the diff function has a body like this:
> kwargs.setdefault('evaluate', True)
> return Derivative(f, *symbols, **kwargs)
>
> and an output is like this: 4*x/(4*x**2 - 1)**(1/2)
>
> Where the output is formatted? Where the operation like ** or - are combined
> with each other member?
>
> Thanks
>
> Alberto
>
> 2012/2/10 Aaron Meurer <asmeu...@gmail.com>
>>
>> We don't have anything like that supported directly. If you want to
>> see how the code path works, the easiest way would be to step through
>> it with a debugger, like pudb.
>>
>> Aaron Meurer
>>
>> On Fri, Feb 10, 2012 at 3:31 AM, Alberto <barbaro.albe...@gmail.com>
>> wrote:
>> > Hi to all,
>> > If i write a line like:
>> >
>> >>>> a
>> > (-sin(sin(x)) + cos(sin(x)))*cos(sin(sin(x)) + cos(sin(x)))
>> >>>> diff(a)
>> > (-sin(sin(x))*cos(x) - cos(x)*cos(sin(x)))*cos(sin(sin(x)) +
>> > cos(sin(x))) - (-
>> > sin(sin(x))*cos(x) + cos(x)*cos(sin(x)))*(-sin(sin(x)) +
>> > cos(sin(x)))*sin(sin(
>> > sin(x)) + cos(sin(x)))
>> >>>>
>> >
>> > How can I see all the operations done by sympy?
>> >
>> > Thanks
>> >
>> > Alberto
>> >
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