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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82943] Re: [mg82870] Re: How to construct a vector whose elements are also vectors?
  • From: "Guofeng Zhang" <guofengzhang at gmail.com>
  • Date: Sun, 4 Nov 2007 06:09:37 -0500 (EST)
  • References: <fg9peo$ms0$1@smc.vnet.net> <200711011026.FAA09034@smc.vnet.net>

Thanks a lot.

On 11/1/07, Szabolcs Horv=E1t <szhorvat at gmail.com> wrote:
>
> Guofeng Zhang wrote:
> > Hi, there,
> >    I'd like to construct a vector whose elements are also vectors. I
> used
> > the following conmands:
>
> Please do read some of the tutorials in the documentation.  If you have
> an older version, start reading the Mathematica book from the beginning.
> If you have version 6, then at least read all of the tutorials from
> guide/LanguageOverview , tutorial/BuildingUpCalculationsOverview , and
> tutorial/ListsOverview (these should be typed into the address bar of
> the doc centre).  After you've finished with these, you can jump around
> randomly in the tutorials of the "Core Language" section, and see what
> Mathematica can do.
>
> > 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}}
>
> It is not very clear from these two lines what you are trying to do.  Do
>   create a 10x2 array, use e.g. Table[x^2 + y^2, {x, 0, 1}, {y, 0, 9}]
>
> Lists are indexed with [[ ]].
>
> And as a newbie, avoid *For* like the plague!  In 99.5% of the cases,
> there is a better way than using For.
>
> > This seems okay. However, I don't know how to endow values to it, for
> > instance change the first {0, 0} to {1,0}.
> >
>
> --
> Szabolcs
>
>



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