hwartz
Sent: Thursday, July 02, 2009 10:20 AM
To: dreamworx
Cc: r-help@r-project.org
Subject: Re: [R] matching rows in matrices
On Jul 2, 2009, at 7:27 AM, dreamworx wrote:
>
> I have a matrix such as this,
>
> [,1] [,2] [,3]
> [1,]112
> [2,]255
>
On Jul 2, 2009, at 7:27 AM, dreamworx wrote:
I have a matrix such as this,
[,1] [,2] [,3]
[1,]112
[2,]255
and a larger matrix such as this,
a b
[1,] 1 5
[2,] 2 5
[3,] 4 9
[4,] 5 8
[5,] 7 8
[6,] 7 10
[7,] 9 10
what I want to do is check the number of tim
If A and B are first and second matrix respectively then try:
rowSums(inner(A, t(B), identical))
where the generalized inner product, inner, is defined in this post:
http://tolstoy.newcastle.edu.au/R/e4/help/08/08/19562.html
On Thu, Jul 2, 2009 at 8:27 AM, dreamworx wrote:
>
> I have a matrix s
I have a matrix such as this,
[,1] [,2] [,3]
[1,]112
[2,]255
and a larger matrix such as this,
a b
[1,] 1 5
[2,] 2 5
[3,] 4 9
[4,] 5 8
[5,] 7 8
[6,] 7 10
[7,] 9 10
what I want to do is check the number of times the columns in the first
matrix appear as r
4 matches
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