[R] connecting matrices

[arun]

Dear Elisa,
Try this:
el<- matrix(1:100,ncol=20)
 set.seed(25)
 el1<- matrix(sample(1:100,20,replace=TRUE),ncol=1)

In the example you showed, there were no column names.  

 list(el[,sort(el1)[1:3]],sort(el1,index.return=TRUE)$ix[1:3])
#[[1]]
 #    [,1] [,2] [,3]
#[1,]   31   61   71
#[2,]   32   62   72
#[3,]   33   63   73
#[4,]   34   64   74
#[5,]   35   65   75
#
#[[2]]
#[1] 9 5 3
A.K.





________________________________
From: eliza botto <eliza_botto at hotmail.com>
To: "smartpink111 at yahoo.com" <smartpink111 at yahoo.com> 
Sent: Thursday, April 25, 2013 9:54 AM
Subject: connecting matrices




Dear Arun,

[text file contains the exact format]
Although the last codes were absolutely correct and worked the way i want them to. I have an additional cover-up question. 
Suppose i have a matrix "el"....... here i show you only some part of that matrix so that codes can work faster.

>el
     [,595586] [,595587] [,595588] [,595589] [,595590] [,595591] [,595592] [,595593] [,595594] [,595595] [,595596] [,595597] [,595598] [,595599] [,595600] [,595601]
[1,]        55        55        55        55        55        55        55        55        55        55        56        56        56        56        56        56
[2,]        59        59        59        59        59        59        60        60        60        61        57        57        57        57        57        57
[3,]        60        60        60        61        61        62        61        61        62        62        58        58        58        58        58        59
[4,]        61        62        63        62        63        63        62        63        63        63        59        60        61        62        63        60
     [,595602] [,595603] [,595604] [,595605] [,595606] [,595607] [,595608] [,595609] [,595610] [,595611] [,595612] [,595613] [,595614] [,595615] [,595616] [,595617]
[1,]        56        56        56        56        56        56        56        56        56        56        56        56        56        56        56        56
[2,]        57        57        57        57        57        57        57        57        57        58        58        58        58        58        58        58
[3,]        59        59        59        60        60        60        61        61        62        59        59        59        59        60        60        60
[4,]        61        62        63        61        62        63        62        63        63        60        61        62        63        61        62        63


In connection to this matrix, there is another matrix which contains coordination values for each of the column of matrix "el"

>el1

[595586,]   5.67   
[595587,]   55.90   
[595588,]   515   
[595589,]   755   
[595590,]   955   
[595591,]   5.95   
[595592,]   575   
[595593,]   505   
[595594,]   505   
[595595,]   515   
[595596,]   5612   
[595597,]   506   
[595598,]   576   
[595599,]   5126   
[595600,]   5216   
[595601,]   5666   
[595602,]   526   
[595603,]   5.6   
[595604,]   156   
[595605,]   4556   
[595606,]   5556   
[595607,]   1256   
[595608,]   1256   
[595609,]   8756   
[595610,]   5906   
[595611,]   789   
[595612,]   5006   
[595613,]   1256   
[595614,]   3356   
[595615,]   7756   
[595616,]   4456   
[595617,]   3356   

What i want in the end is a list of two elemens containing the 10 column of "el" which have the lowest values in matrix "el1".

More precisely
[[1]]
[,595603][,595586][595591,]
565555
575959
596062
626163

[[2]]
5.65.675.95

is it possible to carry out such operation??

thanks for your help

Elisa