Hello,
Try the following.
m <- 120
n <- 10 # in your case this is 1000
mat <- matrix(rnorm(n*m), nrow = m)
fun <- function(x, na.rm = TRUE){
tapply(x, rep(1:12, each = 10), mean, na.rm = na.rm)
}
apply(mat, 2, fun)
apply(mat, 2, fun, na.rm = FALSE) # alternative
Hope this helps,
Rui Barradas
Em 04-04-2014 19:08, eliza botto escreveu:
Dear useRs,
I have a matrix of 120 row and 1000 columns.What I want is to get an average of
a set of 12 rows starting from 1 till 120 for each column. Precisely, for
column 1 the average of 1:10 rows, 11:20 rows.... 111:120. similarly for column
2, 3, 4.... 1000. So in the end i should have a matrix with 12 rows and 1000
columns.
Thankyou very much in advance.
Eliza
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