[R] How to "apply" correctly.

[Keith S Weintraub]

Folks,

# I have the following function:

breakByFreq<-function(freq, defData) {
  breakUpFun<-function(freq, defs) {
    if(freq != 1) {
      defs<-diff(c(0, defs))
      defs<-cumsum(rep(defs/freq, each = freq))
    }
    defs
  }
  defMat<-sapply(defData[,-1], function(x) breakUpFun(freq, x))
  data.frame(Year = 1:nrow(defMat), defMat)
}

# And this data (year column and then 2 columns of data):

dum<-structure(list(Year = 1:10, 
            c1 = c(0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1), 
            c2 = c(0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14, 0.16, 0.18, 0.2)), 
.Names = c("Year", "c1", "c2"), row.names = c(NA, -10L), class = "data.frame")

# This works:
breakByFreq(1, dum)

# This doesn't:
breakByFreq(1, dum[,-3])


# How do I use and choose the appropriate apply function to make this work when there is one and or more columns to be "processed".

Thanks for your time,
KW



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