HI,
Assuming a matrix:
set.seed(15)
mat1<-matrix(sample(-10:10,40,replace=TRUE),ncol=5)
apply(mat1,2,function(x) ifelse(x<0,x+24, x))
# [,1] [,2] [,3] [,4] [,5]
#[1,] 2 4 23 1 0
#[2,] 18 7 10 3 16
#[3,] 10 16 16 16 0
#[4,] 3 3 6 17 3
#[5,] 21 0 6 9 16
#[6,] 10 4 6 0 0
#[7,] 7 8 21 0 20
#[8,] 19 7 15 19 5
A.K.
----- Original Message -----
From: m p <mzp3...@gmail.com>
To: r-h...@stat.math.ethz.ch
Cc:
Sent: Saturday, January 19, 2013 12:17 AM
Subject: [R] an apply question
Hello,
It should be easu but I cannot figure out how to use apply function. I am
trying to replace negative values in an array with these values + 24.
Would appreciate help. Thanks,
Mark
shours <- apply(fhours, function(x){if (x < 0) x <- x+24})
Error in match.fun(FUN) : argument "FUN" is missing, with no default
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