xreplace only does exact structural replacement (the "x" stands for
"exact"). To get mathematical replacement, use subs:
>>> print(exp(5*x).subs(exp(x), sin(x)))
sin(x)**5
Aaron Meurer
On Fri, Aug 14, 2015 at 5:17 AM, AMiT Kumar <dtu.a...@gmail.com> wrote:
> I am also Interested in getting the solution for this.
>
> *AMiT Kumar*
>
>
> On Friday, August 14, 2015 at 12:08:25 PM UTC+5:30, Gaurav Dhingra wrote:
>>
>> Do you want something like replacing some function f1 (say `exponential
>> function` you mentioned `{exp(x): x}` ) with some other f2 (say linear
>> function, you mentioned `{exp(x): x}` ) in your expression ?
>>
>> On Friday, August 14, 2015 at 12:03:08 PM UTC+5:30, Adrián Ashley wrote:
>>>
>>> Correction previous example:
>>>
>>> In [9]: sin(exp(a*x)).some_replace_func({exp(x): x})
>>> Out[9]: sin(x**a)
>>>
>>>
>>>
>>>
>>> On Friday, August 14, 2015 at 11:55:55 AM UTC+5:30, Adrián Ashley wrote:
>>>>
>>>> Hi Sartaj,
>>>>
>>>> I think you didn't understood my point. I am looking for mathematical
>>>> substitution, not exact
>>>> substitution.
>>>>
>>>> exp(5*x).xreplace({exp(5*x): sin(5*x)}) is just a mere example of usage
>>>> of xreplace. I am not
>>>> looking for exact replacement. the exponent can be anything
>>>>
>>>> For example:
>>>>
>>>> >>> sin(exp(x)).some_replace_func({exp: x})
>>>>
>>>> >>> sin(x)
>>>>
>>>> >>> exp(5*x).some_replace_func({exp(x): sin(x)})
>>>> >>> exp(5*x)
>>>>
>>>>
>>>> Thanks,
>>>> Best,
>>>>
>>>> Adrian
>>>>
>>>> On Friday, August 14, 2015 at 1:48:44 AM UTC+5:30, Sartaj Singh wrote:
>>>>>
>>>>> Try this,
>>>>>
>>>>> >>> exp(5*x).xreplace({exp(5*x): sin(5*x)})
>>>>> sin(5*x)
>>>>>
>>>>> On 14 August 2015 at 00:24, Adrián Ashley <adb...@gmail.com> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> How can I substitute/replace something mathematically from an
>>>>>> expression:
>>>>>>
>>>>>> For example:
>>>>>>
>>>>>> >>> exp(5*x).xreplace({exp(x): sin(x)})
>>>>>> >>> exp(5*x) # I would expect sin(x)**5 here
>>>>>>
>>>>>>
>>>>>> In better way to do the above thing?
>>>>>>
>>>>>> Thanks,
>>>>>> Best,
>>>>>>
>>>>>> --
>>>>>> Adrian
>>>>>>
>>>>>> --
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>>>>>> send an email to sympy+un...@googlegroups.com.
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>>>>>> Visit this group at http://groups.google.com/group/sympy.
>>>>>> To view this discussion on the web visit
>>>>>> https://groups.google.com/d/msgid/sympy/4be0109e-a665-4c89-8774-0300163250f0%40googlegroups.com
>>>>>> <https://groups.google.com/d/msgid/sympy/4be0109e-a665-4c89-8774-0300163250f0%40googlegroups.com?utm_medium=email&utm_source=footer>
>>>>>> .
>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Regards
>>>>> *Sartaj Singh*
>>>>>
>>>>> *Mathematics and Computing*,
>>>>> Indian Institute of Technology,
>>>>> Varanasi - 221 005 INDIA
>>>>>
>>>>> E-mail: singhs...@gmail.com, *sartaj.si...@itbhu.ac.in*
>>>>>
>>>> --
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