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