Mateusz Paprocki a écrit :
> Hi,
>
> On Fri, Jun 26, 2009 at 05:57:57PM +0200, Christophe wrote:
>
>> Thanks for that but I have a big problem. How to use all of that for f
>> and g which are strings ?
>> ========================
>>
>> f = 'x**2 + 2*y*x + sin(z)'
>> g = 'x**2 + 2*y*x + sin(x)'
>>
>> ========================
>> I need to work with strings because that will be a program which will
>> call sympy.
>>
>> Christophe.
>>
>>
>
> if you have string input then sympify() it, e.g.:
>
> In [1]: var('x y z')
> Out[1]: (x, y, z)
>
> In [2]: f = 'x**2 + 2*y*x + sin(z)'
>
> In [3]: F = x**2 + 2*y*x + sin(z)
>
> In [4]: g = sympify(f)
>
> In [5]: g
> Out[5]:
> 2
> 2⋅x⋅y + sin(z) + x
>
> In [6]: g == F
> Out[6]: True
>
> So, going back to previous examples, you get:
>
> In [7]: sympify(f).is_polynomial(x)
> Out[7]: True
>
> Most functions in sympy can be given string input and do sympification
> automatically, but in method call case you need to do it on your own.
Thanks a lot for all this informations and this quick answer.
Best regards.
Christophe
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