Re: Silly question on Matrices

• To: mathgroup at smc.vnet.net
• Subject: [mg111547] Re: Silly question on Matrices
• From: Peter Pein <petsie at dordos.net>
• Date: Wed, 4 Aug 2010 07:44:26 -0400 (EDT)
• References: <i3bd6b\$pi8\$1@smc.vnet.net>

Am Wed, 4 Aug 2010 09:51:07 +0000 (UTC)
schrieb "Eduardo M. A. M.Mendes" <emammendes at gmail.com>:

> Hello there
>
> I am new to Mathematica.  In one of my attempts to understand how it
> works, I tried the following example
>
> A={{1,2,3},{4,5,6},{7,8,9}} //MatrixForm
>
> The result seems to be a matrix 3x3 but when I try A[[1][1]], the
> whole first line shows up instead of just one element.  If I don't
> use MatrixForm, it works fine.  How can I see a matrix in nice format
> without wrecking everything?
>
> Many thanks
>
> Ed
>
>

Do not assign MatrixForm[{{<matrix>}}] to a but {{<matrix>}} and throw
MatrixForm onto A:

In[11]:= (A={{1,2,3},{4,5,6},{7,8,9}})//MatrixForm
Out[11]//MatrixForm=
(
1	2	3
4	5	6
7	8	9
)
In[12]:= A[[1,1]] (* A[[1][1]] is wrong *)
Out[12]= 1

hth,
Peter

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