On 07/27/2016 11:49 AM, lily li wrote:
If replace 1:5 to char2 = c('east','west','south','north','central'),
how to put on column names with the original structure? Thanks again.
Have you tried to actually "replace 1:5 with char2", literally?
You need to try things before you ask. That's the only way to learn!
H.
On Wed, Jul 27, 2016 at 12:40 PM, Hervé Pagès <hpa...@fredhutch.org
<mailto:hpa...@fredhutch.org>> wrote:
Hi,
On 07/27/2016 11:17 AM, lily li wrote:
Hi all,
I want to ask that how to create column names for a matrix. For
example,
the matrix below, the column names should be: 1-A, 1-B, 1-C,
1-D, 2-A, 2-B,
2-C, 2-D, 3-A, etc. Thanks for your help.
chars = c('A','B','C','D')
matrix1 = matrix(nrow = length(1:100), ncol =
length(1:5)*length(chars))
k = 0
for(i in seq(1:length(1:5))){
for(j in seq(1:length(chars))){
k = k+1
matrix1[,k] = c(1:100)[k]
}
}
Also how could you possibly use such level of code obfuscation to
perform such simple initialization of your matrix?
My 1st advice would be that you slow down and take the time to compare
seq(1:length(1:5)) with 1:length(1:5) with 1:5. It will be a great
learning experience!
As for initializing your matrix, what about doing
ncol <- 5 * length(chars)
matrix1 <- matrix(seq_len(ncol), nrow=100, ncol=ncol, byrow=TRUE)
instead?
Then set the colnames with:
colnames(matrix1) <- paste(rep(1:5, length(chars)), chars, sep="-")
Cheers,
H.
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Hervé Pagès
Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
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--
Hervé Pagès
Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N, M1-B514
P.O. Box 19024
Seattle, WA 98109-1024
E-mail: hpa...@fredhutch.org
Phone: (206) 667-5791
Fax: (206) 667-1319
______________________________________________
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.
