Hello,
I'm currently writing a program to analyze economic indicators, and need
to identify the indices of peaks and troughs in certain intervals
(business cycles) of my time series. I am using which.max() for this,
which gives me the index of the first max in the interval. However, I
need a function that returns the last max.
One workaround I've thought of is to switch the endpoints of my range
around, i.e.
Instead of:
> x <- c(1:4,8,1:3,8,1,2)
> x
[1] 1 2 3 4 8 1 2 3 8 1 2
> which.max(x[1:11])
[1] 5
Using:
> which.max(x[11:1])
[1] 3
> y <- (length(x[11:1])- which.max(x[11:1]) + 1)
> y
[1] 9
which would return the last max.
However, I'd rather not add this layer of obfuscation to my code if it
can be avoided.
Any suggestions? Thanks in advance for your help.
-Kenny D'Amica
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