Hi,
On 12 August 2011 04:51, Tomo Lazovich <[email protected]> wrote:
> Hi sympy-folk,
>
> If I want to sympify some strings to get symbols from them, but I'd also
> like to have assumptions along with those symbols (in this case, that they
> are real). Is it possible to pass along assumptions to sympify like you
> could to symbols?
>
You can't pass assumptions to sympify(), but, if you know the symbols of
your problem, then you can pass a mapping with those symbols with proper
assumptions set to sympify(), e.g.:
In [1]: a, b = symbols('a,b', positive=True)
In [2]: sympify("log(a*b)").expand()
Out[2]: log(a⋅b)
In [3]: sympify("log(a*b)", {'a': a, 'b': b}).expand()
Out[3]: log(a) + log(b)
>
> Thanks!
>
> Tomo
>
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Mateusz
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