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>