Mateusz Paprocki a écrit :
> In [1]: var('x y z')
> Out[1]: (x, y, z)
>
> In [2]: f = x**2 + 2*y*x + sin(z)
>
> In [3]: g = x**2 + 2*y*x + sin(x)
>
> In [4]: f.is_polynomial(x)
> Out[4]: True
>
> In [5]: g.is_polynomial(x)
> Out[5]: False
>
> However, this can be done in other ways too, e.g.:
>
> In [6]: print f.as_poly(x)
> Poly(x**2 + 2*y*x + sin(z), x)
>
> In [7]: print g.as_poly(x)
> None
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.
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