add assume r>0
r,p = var('r', 'p', domain='real')
assume(r>0)
norm(vector([r*cos(p),r*sin(p)])).simplify_full()
to obtain r
Le samedi 19 avril 2014 20:53:53 UTC+2, Hadi Lq a écrit :
>
> Hi everyone
>
> sage: R.<r,p>=RR[]
> sage: rvec=vector([r*cos(p),r*sin(p)])
> sage: rr=rvec.norm()
> sage: rr.simplify_full()
> sqrt((abs(cos(p))^2 + abs(sin(p))^2)*abs(r)^2)
>
> which must gives me: r
> How can I define real valued vector?
> or How can I withdraw abs() function from norm?
>
> Ubuntu 13.10
> Sage Version 6.1.1, Release Date: 2014-02-04
>
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