[R] peak finding

[Bill.Venables at csiro.au]

It's hard to see how positions 4 and 14 correspond to 'peaks', they look
like troughs to me.  So perhaps this is what you mean:

> x <- c(14,15,12,11,12,13,14,15,16,15,14,13,12,11,14,12)

> y <- which(x == min(x))
> y
[1]  4 14 

as a function:

somefunction <- function(x) which(x == min(x))


Bill Venables
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Research Scholar
Sent: Tuesday, 25 March 2008 12:54 PM
To: r-help at r-project.org
Subject: [R] peak finding

Hi all
 Is there a function that can find the start and end position of peaks
in a
set of numbers.
eg.
x <- c(14,15,12,11,12,13,14,15,16,15,14,13,12,11,14,12)
y <- somefunction(x)

y
4 14


Thanks
John

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