[R] rbind a list of matrices

[arun]

Not sure if this what you wanted.

 do.call(rbind,(matrix.list[desired.matrices]))
#     [,1] [,2] [,3]
#[1,]    1    4    7
#[2,]    2    5    8
#[3,]    3    6    9
#[4,]   19   22   25
#[5,]   20   23   26
#[6,]   21   24   27
A.K.



________________________________
From: Heath Blackmon <coleoguy at gmail.com>
To: r-help at r-project.org 
Sent: Thursday, March 7, 2013 11:52 AM
Subject: [R] rbind a list of matrices

I have a large list of matrices and a vector that identifies the desired
matrices that I would like to rbind.  However, I am stuck on how to get
this to work.  I have written some code below to illustrate my problem:

# 3 simple matrices
a<-matrix(1:9,3,3)
b<-matrix(10:18,3,3)
c<-matrix(19:27,3,3)

#this is the type of list of matrices I am dealing with
matrix.list<-vector("list",3)
matrix.list[[1]]<-a
matrix.list[[2]]<-b
matrix.list[[3]]<-c

#i have a vector that identifies the ones that i want
desired.matrices <- c(1,3)

#i have tried lots of things next but all fail.  This one gets close but I
seem to lose my dim attributes
goal<-rbind(matrix.list[desired.matrices])

Any ideas would be wonderful.

Thanks

Heath

-- 
*Heath Blackmon
Graduate Teaching Assistant
Dept of Biology - Box 19498
Univ. of Texas, Arlington
Arlington, TX 76019
Office: ERB450
Phone 682-444-0538
*

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