Ok, I understood,
Everytime one ask for
'diff(X,Y,N)
if X is a predefined constant then it gives 0. Isn't the " ' " at the
beginig saying "do not evaluate"?
On Thu, Mar 10, 2011 at 1:32 PM, Juan Pablo Carbajal
<carbajal at ifi.uzh.ch> wrote:
> Hi everybody,
>
> Can anybody tell me if there is something wrong here
> (%i0) kill(all);
> (%i1) 'diff(p,t,1); 'diff(%theta,t,1); 'diff(r,t,1); 'diff(%phi,t,1);
>
> (%o1) 'diff(p,t,1)
> (%o2) 'diff(%theta,t,1)
> (%o3) 'diff(r,t,1)
> (%o4) 0
>
> Why is %04 zero?
>
> Thank you very much
>
>
> --
> M. Sc. Juan Pablo Carbajal
> -----
> PhD Student
> University of Z?rich
> www.ailab.ch/carbajal
>
--
M. Sc. Juan Pablo Carbajal
-----
PhD Student
University of Z?rich
www.ailab.ch/carbajal