RE: [R] computing sum of indicator variables
What about
x <- c(2,4,7)
out<-rep(0,max(x))
out[x]<-1
Regards
Wayne
-Original Message-
From: Stefan Böhringer [mailto:[EMAIL PROTECTED]
Sent: 26 July 2004 09:46
To: R Help
Subject: [R] computing sum of indicator variables
My problem is as follows:
i is a list of integers of variable length. Now I want to compute a new
vector/array that contains 1's at the positions indicated in i. For
example:
c(2, 4) -> c(0, 1, 0, 1)
Using something like
i = i - c(0, i[2:length(i) - 1]);
sapply(i, function(x) c(rep(0, x - 1), 1)));
faces me with the problem of concatenating the result, which I could
somehow not find a solution for.
Thank you very much in advance.
Stefan
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Re: [R] computing sum of indicator variables
Hi Stefan, you could try something like, x <- c(2,4,7) as.numeric(!is.na(match(seq(1, max(x)), x))) I hope this helps. Best, Dimitris Dimitris Rizopoulos Doctoral Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/396887 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm - Original Message - From: "Stefan Böhringer" <[EMAIL PROTECTED]> To: "R Help" <[EMAIL PROTECTED]> Sent: Monday, July 26, 2004 10:45 AM Subject: [R] computing sum of indicator variables > My problem is as follows: > i is a list of integers of variable length. Now I want to compute a new > vector/array that contains 1's at the positions indicated in i. For > example: > c(2, 4) -> c(0, 1, 0, 1) > > Using something like > i = i - c(0, i[2:length(i) - 1]); > sapply(i, function(x) c(rep(0, x - 1), 1))); > > faces me with the problem of concatenating the result, which I could > somehow not find a solution for. > > Thank you very much in advance. > > Stefan > > __ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] computing sum of indicator variables
Stefan Böhringer wrote: My problem is as follows: i is a list Do you mean a vector? of integers of variable length. Now I want to compute a new vector/array A vector or an array (which dimensions?)? > that contains 1's at the positions indicated in i. For example: c(2, 4) -> c(0, 1, 0, 1) How long should the result be? max(i)??? If you mean simple vectors in both cases, i's suggest: i <- c(2, 4) x <- numeric(max(i)) x[i] <- 1 Uwe Ligges Using something like i = i - c(0, i[2:length(i) - 1]); sapply(i, function(x) c(rep(0, x - 1), 1))); faces me with the problem of concatenating the result, which I could somehow not find a solution for. Thank you very much in advance. Stefan __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] computing sum of indicator variables
My problem is as follows: i is a list of integers of variable length. Now I want to compute a new vector/array that contains 1's at the positions indicated in i. For example: c(2, 4) -> c(0, 1, 0, 1) Using something like i = i - c(0, i[2:length(i) - 1]); sapply(i, function(x) c(rep(0, x - 1), 1))); faces me with the problem of concatenating the result, which I could somehow not find a solution for. Thank you very much in advance. Stefan __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
