bjmjarrett wrote:
...
rate - function(x){
storage - matrix(nrow=length(x),ncol=1)
ifelse(length(x)==1,storage[1,] - NA,{
storage[1,] - x[1]/max(x)
for(i in 2:length(x)){
p - i-1
storage[i,] - ((x[i] - x[p]) / max(x))
}
I have a function to calculate the rate of increase (the difference between
the value and the previous value divided by the total number of eggs in a
year) of egg production over the course of a year:
rate - function(x){
storage - matrix(nrow=length(x),ncol=1)
storage[1,] - x[1] /
Just jumping into this, but does the ROC(x, type=discrete) function of either
the TTR or caTools (can't remember which) work if you need a prebuilt function?
Also, why are you dividing by the max value? That seems a funny way to
calculate ROC...
On Aug 1, 2011, at 3:14 PM, bjmjarrett
But why not just
c(x[1], diff(x))/max(x)
So simple! Thank you ever so much Berend.
Best wishes,
Ben
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But if you do mean to divide by max(x), I'll also vote for the prior
ROI - function(x) {
if (length(x)==1) return(NA)
r=c(x[1], diff(x))/max(x)
return(r)}
As being about as quick and elegant as this can be done in R.
M
On Aug 1, 2011, at 4:07 PM, R. Michael Weylandt michael.weyla...@gmail.com
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