this can be more efficiently coded using indexing, e.g.,
x <- c(1,2,3,2,1,2,3) n <- length(x) x[2:n] / x[1:(n-1)] Best, Dimitris ---- Dimitris Rizopoulos Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm Quoting Jorge Ivan Velez <[EMAIL PROTECTED]>:
Hi Lydia, Try this: # Function ratio=function(x){ temp=NULL for (n in 1:length(x)) temp=c(temp,x[n]/x[n-1]) temp } # Example x=c(1,2,3,2,1,2,3) ratio(x) [1] 2.0000000 1.5000000 0.6666667 0.5000000 2.0000000 1.5000000 HTH, Jorge On Mon, May 12, 2008 at 9:52 AM, Lydia N. Slobodian <[EMAIL PROTECTED]> wrote:Hello. I'm trying find the ratios between each of the integers in a vector. I have: for (n in x) { ratio <- (x[n]/x[n-1]) ratio.all <- c(ratio.all, ratio) } Of course this doesn't work, nor does diff(n)/diff(n-1). Is there a way to specify a pair of integers in a vector? Thank you, Lydia ______________________________________________ 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.[[alternative HTML version deleted]] ______________________________________________ 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.
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