On Jan 18, 2013, at 9:17 PM, m p wrote:
Hello, It should be easu but I cannot figure out how to use apply function.
Unless this is a homework question then using `apply` seems inefficient.
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
You should not use the assignment operator in the expression that forms the consequent for `ifelse`. (Furthermore apply takes three arguments and you only have two.)
Vectorize: mat1<-matrix(sample(-10:10,40,replace=TRUE),ncol=5) mat1[mat1 < 0] <- mat1[mat1 < 0]+24 mat1 [,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
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David Winsemius, MD Alameda, CA, USA ______________________________________________ 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.