runmin <-
function(x, k)
{
n <- length(x)
y <- rep(NA, n)
a <- y[k] <- min(x[1:k])
for (i in (k+1):n)
{
y[i] <- min(x[i - 0:(k-1)],na.rm=TRUE) # calculate min of the window
}
return(y)
}
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