Re: Help: Column/Row Vector
- To: mathgroup at smc.vnet.net
- Subject: [mg4274] Re: Help: Column/Row Vector
- From: ianc (Ian Collier)
- Date: Sat, 29 Jun 1996 03:52:32 -0400
- Organization: Wolfram Research, Inc.
- Sender: owner-wri-mathgroup at wolfram.com
In article <4q5k2d$bsb at dragonfly.wolfram.com>, khinast at nld.chee.uh.edu wrote:
> Hi,
>
> 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:
>
> khinast at nld.chee.uh.edu
>
>
> Joh.
You need to represent them as two dimensional matrices. I believe the
following will do what you want:
In[8]:=
x ={{x1},{x2}}
Out[8]=
{{x1}, {x2}}
In[9]:=
MatrixForm[ x]
Out[9]//MatrixForm=
x1
x2
In[10]:=
y = {{y1,y2}}
Out[10]=
{{y1, y2}}
In[11]:=
MatrixForm[y]
Out[11]//MatrixForm=
y1 y2
In[12]:=
x.y
Out[12]=
{{x1 y1, x1 y2}, {x2 y1, x2 y2}}
I hope this helps.
-----------------------------------------------------------
Ian Collier
Wolfram Research, Inc.
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tel:(217)-398-0700 fax:(217)-398-0747 ianc at wolfram.com
Wolfram Research Home Page: http://www.wolfram.com/
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