Re: [Outer [Times, , ] ] Question
- To: mathgroup at smc.vnet.net
- Subject: [mg45855] Re: [Outer [Times, , ] ] Question
- From: Mariusz Jankowski<mjankowski at usm.maine.edu>
- Date: Tue, 27 Jan 2004 04:51:01 -0500 (EST)
- Organization: University of Southern Maine
- References: <bv00aa$jda$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Remove MatrixForm from your lines m1 = ..., m2 = ... etc
Mariusz
>>> <MichaelSMcCain at cs.com> 1/25/2004 3:55:38 AM >>>
Hi:
I want to take a Column Vector and multiply it by a Row Vector to create an
"Outer" Matrix.
In other words, I want to take a 5x1 Column Vector and multiply it by a 1x4
Row Vector and output a 5x4 Matrix.
I then want to add several of these Matrices together and obtain a "final"
Matrix.
I tried the following:
x1 = {1, -1, -1, 1, 1};
y1 = {1, 1, -1, -1};
x2 = {-1, 1, -1, 1, -1};
y2 = {1, -1, 1, -1};
x3 = {1, 1, -1, -1, 1};
y3 = {-1, -1, 1, 1};
m1 = MatrixForm[Outer [Times, x1, y1] ]
m2 = MatrixForm[Outer [Times, x2, y2] ]
m3 = MatrixForm[Outer [Times, x3, y3] ]
mm = m1 + m2 + m3
MatrixForm[mm]
The output that I get is incorrect and does not combine into a single
Matrix.
What am I doing wrong?
Thanks,
Mike McCain
MichaelSMcCain at cs.com