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Re: Matrix with number of rows / columns not fixed

• To: mathgroup at smc.vnet.net
• Subject: [mg112253] Re: Matrix with number of rows / columns not fixed
• From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
• Date: Tue, 7 Sep 2010 02:00:01 -0400 (EDT)
• References: <i627tm$bm$1@smc.vnet.net>

As far as I know this is not possible. Matrices need not be of fixed
size and can be extended and chopped as you wish, but never have a
symbolic size.

Cheers -- Sjoerd

On Sep 6, 10:14 am, Hayley <hayley0... at gmail.com> wrote:
> I'm new to Mathematica and would like to know if I can specify a
> matrix where the number of rows / columns is not fixed.
>
> As a simple example, how can I input a diagonal matrix with elements
> (s1, s2, ..., sL) where I don't specify what L is?
>
> I'd like to multiply together a few such matrixes and find the inverse
> of the product, and would ideally like Mathematica to give me the
> answer in terms of summations from 1 to L.
>
> Hope this sounds possible...!