Hello, just a couple of short questions that would be much appreciated. Is there a way of putting a vectors inputs in size order from low to high? And if I had a random list or TRUE and FALSE, is there a way of finding the 100th TRUE? Thank you very much, Elliot Welch elliot.welch at virgin.net Sent from my BlackBerry? smartphone
Hi, On Sun, Feb 19, 2012 at 7:47 PM, <elliot.welch at virgin.net> wrote:> Hello, just a couple of short questions that would be much appreciated. > > Is there a way of putting a vectors inputs in size order from low to high?See: ?order, ?sort> And if I had a random list or TRUE and FALSE, is there a way of finding the 100th TRUE?Let's make this more tractable -- say I want to find the 3rd TRUE in: x <- c(TRUE, FALSE, TRUE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE) Then: which(cumsum(x) == 3) ## [1] 7 HTH, -steve -- Steve Lianoglou Graduate Student: Computational Systems Biology ?| Memorial Sloan-Kettering Cancer Center ?| Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact
Hi, When replying to mails from r-help, please hit "reply all" so that people can follow along so that everyone can benefit from the help, as well as getting more eyeballs on your questions so you get better help. Now: On Sun, Feb 19, 2012 at 8:54 PM, <elliot.welch at virgin.net> wrote:> Brilliant, thanks for the help. Do you know how to find how many pairs of letters there are in a vector? For example in AABCCC there would be 3 pairs?I'm not sure what you mean. Please give an example of your input data, and what you expect to get out of it, as well as showing us (in code) what you've already tried. I get the sense that you're pretty new to R. You're going to have to do some homework in order to come up to speed w/ the basics of the language. You can start here: http://cran.r-project.org/doc/manuals/R-intro.pdf HTH, -steve -- Steve Lianoglou Graduate Student: Computational Systems Biology ?| Memorial Sloan-Kettering Cancer Center ?| Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact