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Re: How to construct a vector whose elements are also vectors?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82871] Re: [mg82813] How to construct a vector whose elements are also vectors?
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Thu, 1 Nov 2007 05:27:05 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200710311120.GAA22728@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

    stat = Partition[Table[0, {20}], 2]
{{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}}

    stat[[1]] = {29, -17};
    stat
{{29,-17},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}}

    stat[[{3,5}]]={{"Hello","world!"},{x,y}};
    stat
{{29,-17},{0,0},{Hello,world!},{0,0},{x,y},{0,0},{0,0},{0,0},{0,0},{0,0}}

(It's worth your while to read and try the Mathematica documentation 
about List some more.  Don't use iteration if you don't need to.)

Guofeng Zhang wrote:
> Hi, there,
>    I'd like to construct a vector whose elements are also vectors. I used
> the following conmands:
> 
> Table[stat[i], {i, 1, 10}];
> For[i = 1, i <= 10, (stat[i] = Array[0 &, {10, 2}]); i++];
> 
> Then I try
> stat[1]
> which yields
> {{0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0,  0},
> {0, 0}}
> 
> This seems okay. However, I don't know how to endow values to it, for
> instance change the first {0, 0} to {1,0}.
> 
> Thank you for your time and help!
> Henry
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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