Re: How to construct a vector whose elements are also vectors?
- To: mathgroup at smc.vnet.net
- Subject: [mg82847] Re: How to construct a vector whose elements are also vectors?
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 1 Nov 2007 05:14:39 -0500 (EST)
- Organization: Uni Leipzig
- References: <fg9peo$ms0$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi,
the bad news first, you have *not* created a vector, you
have created a function stat[] and it would be difficult
to change the function values. You have mixed up the
function call stat[i] with the Part[] operation somearray[[i]].
You mean
stat=Table[0,{10},{2}]
and
stat[[1]] as you expect.
and
stat[[1,1]]=1
will assign a value to the first component of the first vector.
Regards
Jens
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
>
>