[R] Bind field of a list
Hello all
I am new in R and so easy stuff are difficult...
let say that I have a list
test <- list(a=c("x","v"),b=c("n","m"))
how can I without a loop get test$a bind with test$b (obviously in real life
their would be many fields)
Cheers and thanks
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Re: [R] Bind field of a list
Hello,
Thank you but I think not what I would like to get as an answer is the list
("x","v","n","m") + what you gave me could work for 2 fields but if I have
200...
What I want is a vectorize way to do
bindlists <- function(x){
output = c();
for (i in 1:length(x))
{
output = c(output,x[[i]])
}
return(output)
}
Regards
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Re: [R] Bind field of a list
Bravo baptiste it works what does do.call do exactly ?? -- View this message in context: http://n4.nabble.com/Bind-field-of-a-list-tp1561676p1561745.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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.
[R] Accessing values of a matrix
hello all, thank you for taking the time I have a matrix A that have column names (let say n columns), I want to reduce the matrix to have just a few of those column (p colums, this is trivial), but for the lines I want only the lines such that A(i,J) is part of a list (J is fixed and known) I am sure it is very easy but I don't find it (I tryed which but it doesn't seem to work) Surely I could do a loop but I want to learn how to do things without time consuming loops. Thanks Colin -- View this message in context: http://n4.nabble.com/Accessing-values-of-a-matrix-tp1561932p1561932.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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.
Re: [R] Accessing values of a matrix
Hello Sarah, thanks for answering
For example if I have the following example
test <- as.data.frame(matrix(c(1,2,3,4, 11,12,13,14, "a","b","b","c"), nrow
= 3, ncol=3,dimnames = list(c("r1","r2","r3","r4"),NULL))
V1 V2 V3
r1 1 11 a
r2 2 12 b
r3 3 13 b
r4 4 14 c
it is easy to select test <- test[,mylist] with for example mylist <-
c("V1","V3")
V1 V3
r1 1 a
r2 2 b
r3 3 b
r4 4 c
But after how can I restrict test in selecting the rows where the result in
column V3 are in a list mylist2, with for example mylist2 <-c("b","c","d") ?
which would give as an example
V1 V3
r2 2 b
r3 3 b
r4 4 c
Regards
Colin
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Re: [R] Accessing values of a matrix
OKKK Thanks a lot for letting me know the subset function Cheers -- View this message in context: http://n4.nabble.com/Accessing-values-of-a-matrix-tp1561932p1564724.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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.
