Message-ID: <1362680659.11521.YahooMailNeo@web142605.mail.bf1.yahoo.com>
Date: 2013-03-07T18:24:19Z
From: arun
Subject: rbind a list of matrices
In-Reply-To: <CAJVSDADZQkOgWXhV2xtmUGAetDEvO_01g_0P6KkuedoH_DE6GQ@mail.gmail.com>
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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