Re: Almost symbolic computations (?)
- To: mathgroup at smc.vnet.net
- Subject: [mg90492] Re: Almost symbolic computations (?)
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 10 Jul 2008 07:32:05 -0400 (EDT)
- Organization: Uni Leipzig
- References: <g54oim$etu$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi,
and ax, ay and az should not be functions of
your space variables ? For constants the derivative
is always 0
Regards
Jens
Barbara Da Vinci wrote:
> Dear MathGroup
>
> This is an example of the problem
> I'm facing.
>
> The code
>
> Needs["VectorAnalysis`"];
> Head /@ {ax, ay, az}
> A = {ax, ay, az};
> Curl[A]
>
> returns
>
> {Symbol, Symbol, Symbol}
> {0, 0, 0}
>
> Instead, I would get the
> well known symbolic form
>
> d_y az - d_z ay
> ...
>
> I have been trying, for
> a while, to perform string
> manipulations but that,
> of course, lays to ashes
> the possibility to recognize
>
> d_y az + d_y az = 2 d_y az
>
> and so on.
>
> Any way to get out of it ?
>
> Kind regards
>
>
> Barbara Da Vinci
>