[R] position of an element in a vector

Marc Schwartz mschwartz at medanalytics.com
Thu Feb 13 23:00:37 CET 2003

>-----Original Message-----
>From: r-help-admin at stat.math.ethz.ch 
>[mailto:r-help-admin at stat.math.ethz.ch] On Behalf Of Jason Bond
>Sent: Thursday, February 13, 2003 3:41 PM
>To: R-help at stat.math.ethz.ch
>Subject: [R] position of an element in a vector
>Hello.  Sorry for the elementary post.  I've looked through the 
>documentation, but can't seem to find a function which allows one to 
>extract the position of an element within a list...for example 
>the position 
>of the element 4 in the vector c(1,2,4,3,6) is 3.  Thanks much 
>for any help.
>   Jason

Take a look at ?which.

For example:

> which(c(1,2,4,3,6) == 4)
[1] 3



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