Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1996
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1996

[Date Index] [Thread Index] [Author Index]

Search the Archive

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.
-----------------------------------------------------------
tel:(217)-398-0700   fax:(217)-398-0747    ianc at wolfram.com
Wolfram Research Home Page:         http://www.wolfram.com/
-----------------------------------------------------------

==== [MESSAGE SEPARATOR] ====


  • Prev by Date: Re: Mandelbrot & Julia sets
  • Next by Date: Re: Help: Column/Row Vector
  • Previous by thread: Help: Column/Row Vector
  • Next by thread: Re: Help: Column/Row Vector