Lukas - 10 months ago 40

R Question

I have a time series where I identified the local maxima. Now I want to find the indices of the first elements with a value of zero looking back from the maxima. E.g.

`my.seq <- c(sin(0:(2*pi)), rep(0, 5), sin(seq(0, (2*pi), 0.5)))`

local maxima:

`indx.max <- c(3, 16)`

I want to get:

`c(1, 13)`

Thanks

Source (Stackoverflow)