[R] summarise subsets of a vector

[arun]

Hi,
try this:
 unlist(lapply(split(test,((seq_along(test)-1)%/% 10)+1),mean))
#       1        2        3        4        5        6        7        8 
#0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.146375 
  #     9       10       11 
#0.000000 0.194500 0.000000 

A.K.



----- Original Message -----
From: Wim Kreinen <wkreinen at gmail.com>
To: r-help <r-help at r-project.org>
Cc: 
Sent: Tuesday, January 22, 2013 6:09 PM
Subject: [R] summarise subsets of a vector

Hello,

I have vector called test. And now I wish to measure the mean of the first
10 number, the second 10 numbers etc
How does it work?
Thanks Wim

> dput (test)
c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0.71, 0.21875, 0, 0.27375, 0.26125,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.84125,
0.0575, 0.92625, 0.12, 0, 0)

    [[alternative HTML version deleted]]

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