Re: Help: Column/Row Vector
- To: mathgroup at smc.vnet.net
- Subject: [mg4295] Re: Help: Column/Row Vector
- From: rubin at msu.edu (Paul A. Rubin)
- Date: Sat, 29 Jun 1996 03:56:15 -0400
- Organization: Michigan State University
- 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: I'm not sure just how you're planning to multiply x and y; the inner product (Inner[], Dot[]) and outer product (Outer[]) operations work quite well with two column vectors. In any event, if you need to distinguish the two, try this: In[]:= x := {x1, x2}; y := {{y1}, {y2}}; In[]:= Dimensions[ x ] Out[]= {2} In[]:= Dimensions[ y ] Out[]= {2, 1} Or maybe you want In[]:= x := {{x1, x2}}; Dimensions[ x ] Out[]= {1, 2} Paul ************************************************************************** * Paul A. Rubin Phone: (517) 432-3509 * * Department of Management Fax: (517) 432-1111 * * Eli Broad Graduate School of Management Net: RUBIN at MSU.EDU * * Michigan State University * * East Lansing, MI 48824-1122 (USA) * ************************************************************************** Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. J. W. v. GOETHE ==== [MESSAGE SEPARATOR] ====