Re: Did something change?
- To: mathgroup at smc.vnet.net
- Subject: [mg58128] Re: [mg58109] Did something change?
- From: Adel Elsabbagh <aelsabbagh at gmail.com>
- Date: Sun, 19 Jun 2005 03:43:33 -0400 (EDT)
- References: <200506181008.GAA08878@smc.vnet.net>
- Reply-to: Adel Elsabbagh <aelsabbagh at gmail.com>
- Sender: owner-wri-mathgroup at wolfram.com
I am not a Mathematica professional but as far as I know, you cannot do
such assignment.
You'd better do the following:
F = Table[0, {i, 10}, {j, 8}, {k, 8}]; (*initialize a tensor of size 10x8x8*)
Do[F[[i]] = IdentityMatrix[8]; F[[i, 1, 3]] = 7, {i, 10}]; (*Fill the elements*)
-Adel Elsabbagh
On 6/18/05, Ronald Bruck <bruck at math.usc.edu> wrote:
> Recently I created a list of several matrices, something like
>
> Do[F[i] = IdentityMatrix[8]; F[i][[1,3]] = 7, {i,10}]
>
> and was surprised to get the message that F[i] wasn't a symbol. I'm
> pretty sure code similar to that worked prior to Mathematica 5. Did
> something change?
>
> I've also tried Symbolize[F[i]] in that loop, but it doesn't help;
> Mathematica refuses to access part [[1,3]] of F[i], claiming F[i] isn't
> a symbol.
>
> How are you supposed to set the individual values of a matrix if you
> can't do this? This is an EXTREMELY unhelpful "feature".
>
> --Ron Bruck
>
>
--
Adel
- References:
- Did something change?
- From: Ronald Bruck <bruck@math.usc.edu>
- Did something change?