Re: Help: Column/Row Vector
- To: mathgroup at smc.vnet.net
- Subject: [mg4273] Re: Help: Column/Row Vector
- From: Stephen P Luttrell <luttrell at signal.dra.hmg.gb>
- Date: Sat, 29 Jun 1996 03:52:22 -0400
- Organization: Defence Research Agency, Malvern
- Sender: owner-wri-mathgroup at wolfram.com
khinast at nld.chee.uh.edu wrote:
> I have two vectors x=(x1,x2) and y = (y1,y1). How can I persuade Mathematica
> that e.g. x is a column vector and y is a row vector, which is kind of
> important for their multiplication .
> I've studied the help page for hours, with no result. So could
> someone please help me. My email address is:
Try inputting the following:
x = {x1,x2};
y = {y1,y2};
inprod = x.y
outprod = Outer[Times, x, y]
It produces this output (i.e. the inner and outer products of
vectors x and y):
x1 y1 + x2 y2
{{x1 y1, x1 y2}, {x2 y1, x2 y2}}
--
Dr Stephen P Luttrell luttrell at signal.dra.hmg.gb
Adaptive Systems Theory 01684-894046 (phone)
Room EX21, Defence Research Agency 01684-894384 (fax)
Malvern, Worcs, WR14 3PS, U.K. http://www.dra.hmg.gb/cis5pip/Welcome.html
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