From: Sebastian Luque <spluque_at_gmail.com>

Date: Sun 19 Feb 2006 - 09:07:42 EST

Date: Sun 19 Feb 2006 - 09:07:42 EST

Hello,

I'm trying to build a frequency table for a vector, broken down by the combination of factors. For further analyses, I need to have the result arranged in a new data frame, with the upper limit of the histogram's breaks, the per bin count, and the factors identifying each record. My problem is including the latter:

---<---------------cut here---------------start-------------->---

toydf <- expand.grid(sample(0:50, 50, TRUE), c("A", "B"),

c("pop1", "pop2", "pop3", "pop4", "pop5"))

"getFreq" <- function(x, bks)

{

fhist <- hist(x, breaks = bks, plot = FALSE,

include.lowest = TRUE) matrix(c(fhist$breaks[-1], fhist$counts), nrow = length(fhist$breaks[-1]), ncol = 2)}

freqs <- by(toydf[[1]], list(toydf[[2]], toydf[[3]]), getFreq, bks = 0:50)

---<---------------cut here---------------end---------------->---

so I'd need to do some manipulation with dimnames(freqs), which contains the levels of the factors supplied to 'getFreq', to assign the factors to each element of the matrix value of 'by'. I could then do:

do.call(rbind, freqs)

to obtain the final data frame, which would then have all the necessary information.

Any help with manipulation of the dimnames(freqs) (or something even better) would be very appreciated!

Cheers,

-- Sebastian P. Luque ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.htmlReceived on Sun Feb 19 09:31:40 2006

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