On Nov 28, 9:14 am, Robert Bradshaw <[EMAIL PROTECTED]>
wrote:
> On Nov 27, 2008, at 6:58 AM, [EMAIL PROTECTED] wrote:
>
> > Hello,
>
> > the example below shows that a complex number ( i think the "I" stands
> > for it ? ) appears by doing a simplify_full. Is there a way to prevent
> > this and to get output in real number format?
>
> > sage: var('omgo zr ys cz')
> > sage: eqomgo = omgo == (sqrt(2*ys - 2*cz)*sqrt(2*zr - 2*cz))/(2*zr -
> > 2*cz)
> > sage: eqomgo.rhs().simplify_full()
> > I*sqrt(cz - ys)/sqrt(zr - cz)
>
> Is ys assumed to be larger than cz? What about zr and cz? You can use
> the assume command
>
> sage: assume(ys > cz)
> sage: assume(zr > cz)
>
> Then do
>
> sage: sage: eqomgo.rhs().simplify_full().real()
> -sqrt(ys - cz)/sqrt(zr - cz)
>
Thanks for your answer!
Sorry, i didn't wrote that we tried the assume command. We just forgot
to use the real() function...
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