If I understand correctly, you can try: m <- matrix(sample(0:5, 24, rep = TRUE), nc = 3)
# A list with the index lapply(apply(m == 0, 2, which), head, 1) # A vector unlist(lapply(apply(m == 0, 2, which), head, 1)) On Fri, Jul 11, 2008 at 2:06 PM, Rheannon <[EMAIL PROTECTED]> wrote: > > Hello, > > I am trying to loop through a matrix column and find the first value <=0 and > store that matrix location in a variable called Start. > > I have tried the following: > i <- 1 > j <- 1 > while (Matrix[i, j] > 0) > i = (i + 1) > #loop until matrix [i, j] value <= 0 > #strore that row number in a variable > Start <- i > > I am getting a scripting out of bounds error and I suspect maybe the loop > isnt stoping at the end of the matrix? > > Any help is greatly appreciated! > Cheers, > Rheannon > > -- > View this message in context: > http://www.nabble.com/While-loop-tp18408462p18408462.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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.
