If the increases or decreases could be any size,
rle(sign(diff(x))) could do it:
> x <- c(1, 2, 3, 4, 4, 4, 5, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1)
> r <- rle(sign(diff(x)))
> r
Run Length Encoding
lengths: int [1:5] 3 2 2 5 4
values : num [1:5] 1 0 1 -1 0
> i1 <- which(r$lengths==max(r$lengths[r$values==1]) &
r$values==1)[1]
> i2 <- which(r$lengths==max(r$lengths[r$values==-1]) &
r$values==-1)[1]
> i1
[1] 1
> i2
[1] 4
> rbind(up=c(start=cumsum(c(1, r$lengths))[i1],
len=r$lengths[i1]), down=c(start=cumsum(c(1,
r$lengths))[i2], len=r$lengths[i2]))
start len
up 1 3
down 8 5
>
Ingmar Visser wrote:
rle(diff(sq)) could be helpful here,
best, Ingmar
On May 13, 2008, at 11:19 PM, Marko Milicic wrote:
Hi all R helpers,
I'm trying to comeup with nice and elegant way of "detecting" consecutive
increases/decreases in the sequence of numbers. I'm trying with
combination
of which() and diff() functions but unsuccesifuly.
For example:
sq <- c(1, 2, 3, 4, 4, 4, 5, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1);
I'd like to find way to calculate
a) maximum consecutive increase = 3 (from 1 to 4)
b) maximum consecutive decrease = 5 (from 6 to 1)
All ideas are highly welcomed!
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