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Almost symbolic computations (?)

• To: mathgroup at smc.vnet.net
• Subject: [mg90466] Almost symbolic computations (?)
• From: Barbara Da Vinci <barbaradavinci at tahoo.it>
• Date: Thu, 10 Jul 2008 06:35:14 -0400 (EDT)

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

• Follow-Ups:
  • Re: Almost symbolic computations (?)
    • From: "W_Craig Carter" <ccarter@mit.edu>