Just initiate r as
r = Symbol('r', positive=True).
Aaron Meurer
On Feb 3, 2010, at 9:07 AM, archeryguru2000 wrote:
> Hello all,
> I have an issue with an integral I'm trying to evaluate. I have a
> matrix where each element is a function of (among other terms) an
> integrated Legendre polynomial. My opportunity is that certain
> returns are in the form of absolute values. For example, an output to
> one particular element is:
>
>>>> Integral(-30**(1/2)*r**2*abs(r)/2, (r, 0, 1))
> where r is a radial distance... always greater than (or equal to)
> zero.
>
> I was wondering, is there a way to tell sympy/python that r is always
> greater than zero? Is there an option/kwarg in one of the evalf/subs/
> simplify/etc functions that allow for that substitution?
>
> Thanks again,
> ~~archery~~
>
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