[R] which.minimums not which.min

[Liaw, Andy]

What you want seems to be the valleys and peaks in the data.  If so, try:

  RSiteSearch("find peaks")

which points to a post by Philippe Grosjean, pointing to the pastesc
package:

> library(pastecs)
Loading required package: boot
> tp <- turnpoints(x)
> which(tp$peaks)
[1]  4 10
> which(tp$pits)
[1]  5 11

Andy
 

From: Fred J.
> 
>   Hi
>    
>   Is there a function which determines the location, i.e., 
> index of the all minimums or maximums of a numeric vector.
>   Which.min(x) only finds the (first) of such.
>    
>   > x <- c(1:4,0:5, 4, 11)
>   > x
>    [1]  1  2  3  4  0  1  2  3  4  5 4 11
>   > which.min(x)
>   [1] 5
>   > which.max(x)
>   [1] 11
>   >
>    
>   but I need 
>   which.min(x)  to be 5 11
>   which.max(x) to be 4 10
>    
>   thanks
>    
>   
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