Re: [R] block averaging data frames

Almost except tapply(x[4:8], x$interval, colMeans) works but with a larger data frame I have problems, even tapply(x[4:7], x$interval, colMeans) gets the "arguments must have the same length" error. But they do! Any ideas? Thanks for your help Jim On 12/19/2011 2:00 PM, jim holtman wrote: Do

Re: [R] block averaging data frames

Hmm, almost but my real data frame is much larger (128 columns). The problem is with this line newData <- do.call(rbind, tapply(x[4:8], x$interval, colMeans)) when I do tapply(x[4:8], x$interval, colMeans) all works but when I do tapply(x[4:7], x$interval, colMeans) I get Error in tapply(

Re: [R] block averaging data frames

Does this work for you: > x <- read.table(text = " date time Voltage LwTempDownelling LwDownwelling > LwDownwelling_min LwDownwelling_max LwTempUpwelling + 1 2011-11-01 00:00:00 2.73244717.30 30.0 14.0 39.5 17.83 + 2 2011-11-01 00:10:00 2.731534