[R] Indexing problem with matrix
bogaso.christofer at gmail.com
Fri Jul 22 19:18:32 CEST 2011
Thanks Joshua and Berton for your pointers. Yes it was typo as I wanted to mean to select few columns.
From: Joshua Wiley [mailto:jwiley.psych at gmail.com]
Sent: 22 July 2011 22:02
To: Bogaso Christofer
Cc: r-help at r-project.org
Subject: Re: [R] Indexing problem with matrix
On Fri, Jul 22, 2011 at 9:46 AM, Bogaso Christofer
<bogaso.christofer at gmail.com> wrote:
> Dear all, assume I have a matrix with just 1 row. Now suppose I want to
> fetch 1st few rows from that matrix, however resulting object becomes
I'm assuming you mean the first few columns. The place to look is
?"[" where you would find the drop argument.
matrix(1:5, 1)[, -1, drop = FALSE]
> vector. Here is 1 such example:
>> matrix(1:5, 1)
> [,1] [,2] [,3] [,4] [,5]
> [1,] 1 2 3 4 5
>> matrix(1:5, 1)[,-1]
>  2 3 4 5
> Can somebody point me how to keep resulting object as matrix with same row?
> Ofcourse I again make legitimate matrix with something like as.matrix()
> function. However I believe there must be some more directly way with
> indexing in some better way!
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Ph.D. Student, Health Psychology
University of California, Los Angeles
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