On Mon, 5 Apr 2010 00:39:02 -0700 (PDT)
Kwankyu <[email protected]> wrote:

> sage: f=sqrt(pi)^-1*exp(-x^2/2); f
> e^(-1/2*x^2)/sqrt(pi)
> sage: g=integral(f,(x,0,2)); g
> 1/2*sqrt(2)*erf(sqrt(2))
> sage: n(g)
> Traceback (most recent call last):
> ...
> TypeError: cannot evaluate symbolic expression numerically
> sage: h=1/2*sqrt(2)*erf(sqrt(2))
> sage: n(h)
> 0.674933236039321
> 
> Apparently, there is no difference between g and h. Perhaps internal
> representations are different...

This is the same problem mentioned here:

http://trac.sagemath.org/sage_trac/ticket/8459#comment:2

I fixed this and #7661 last night, patch coming soon.

Thank you.

Burcin

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