Jeff,
Again my thanks for your guidance.
I replaced dimnames(myvalues)<-list(NULL,c(zzz))
with
colnames(myvalues)<-zzz
and get the same error,
Error in dimnames(x) <- dn :
length of 'dimnames' [2] not equal to array extent
It appears that I am creating the string zzz in a manner that is not
compatable with either
dimnames(myvalues)<-list(NULL,c(zzz))
or
colnames(myvalues)<-zzz
I think I need to modify the way I create the string zzz.
# create variable names xxx1 and xxx2.
string=""
for (j in 1:2){
name <- paste("xxx",j,sep="")
string <- paste(string,name)
print(string)
}
# Creation of xxx1 and xxx2 works
string
# Create matrix
myvalues <- matrix(nrow=2,ncol=4)
head(myvalues,1)
# Add "j" and "k" to the string of column names
zzz <- paste("j","k",string)
zzz
# assign column names, j, k, xxx1, xxx2 to the matrix
# create column names, j, k, xxx1, xxx2.
dimnames(myvalues)<-list(NULL,c(zzz))
colnames(myvalues)<-zzz
________________________________________
From: Jeff Newmiller <jdnew...@dcn.davis.ca.us>
Sent: Monday, July 3, 2023 2:45 PM
To: Sorkin, John
Cc: r-help@r-project.org
Subject: Re: [R] Create matrix with column names wiht the same prefix
xxxx and that end in 1, 2
I really think you should read that help page. colnames() accesses
the second element of dimnames() directly.
On July 3, 2023 11:39:37 AM PDT, "Sorkin, John"
<jsor...@som.umaryland.edu> wrote:
Jeff,
Thank you for your reply.
I should have said with dim names not column names. I want the Mateix
to have dim names, no row names, dim names j, k, xxx1, xxx2.
John
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and
Geriatric Medicine
Baltimore VA Medical Center
10 North Greene Street<x-apple-data-detectors://12>
GRECC<x-apple-data-detectors://12> (BT/18/GR)
Baltimore, MD 21201-1524<x-apple-data-detectors://13/0>
(Phone) 410-605-711<tel:410-605-7119>9
(Fax) 410-605-7913<tel:410-605-7913> (Please call phone number above
prior to faxing)
On Jul 3, 2023, at 2:11 PM, Jeff Newmiller <jdnew...@dcn.davis.ca.us>
wrote:
?colnames
On July 3, 2023 11:00:32 AM PDT, "Sorkin, John"
<jsor...@som.umaryland.edu> wrote:
I am trying to create an array, myvalues, having 2 rows and 4
columns, where the column names are j,k,xxx1,xxx2. The code below
fails, with the following error, "Error in dimnames(myvalues) <-
list(NULL, zzz) :
length of 'dimnames' [2] not equal to array extent"
Please help me get the code to work.
Thank you,
John
# create variable names xxx1 and xxx2.
string=""
for (j in 1:2){
name <- paste("xxx",j,sep="")
string <- paste(string,name)
print(string)
}
# Creation of xxx1 and xxx2 works
string
# Create matrix
myvalues <- matrix(nrow=2,ncol=4)
head(myvalues,1)
# Add "j" and "k" to the string of column names
zzz <- paste("j","k",string)
zzz
# assign column names, j, k, xxx1, xxx2 to the matrix
# create column names, j, k, xxx1, xxx2.
dimnames(myvalues)<-list(NULL,zzz)
______________________________________________
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PLEASE do read the posting guide
http://www.r-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Sent from my phone. Please excuse my brevity.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
--
Sent from my phone. Please excuse my brevity.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.