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
*
[[alternative HTML version deleted]]
?do.call ## as in do.call(rbind, list_of_matrices) ## Note that list_of_matrices must be a **list**. -- Bert On Thu, Mar 7, 2013 at 8:52 AM, Heath Blackmon <coleoguy at gmail.com> wrote:> 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 > * > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.-- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
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
*
??? [[alternative HTML version deleted]]
______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
On 07-03-2013, at 17:52, Heath Blackmon <coleoguy at gmail.com> wrote:> 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.do.call(rbind,matrix.list) Berend