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summarise subsets of a vector

David L Carlson 
You didn't indicate what you want to do with the 101st observation. Arun's
solution creates an 11th group and divides by the number in the group(1),
while Jessica's solution creates an 11th column and divides by 10.
1          2          3          4          5          6          7

  0.000000   0.000000   0.000000   0.000000   0.000000   0.000000   0.000000

         8          9         10         11 
  0.146375   0.000000   0.194500 100.000000
Warning message:
In matrix(test, nrow = 10) :
  data length [101] is not a sub-multiple or multiple of the number of rows
[10]
[1]  0.000000  0.000000  0.000000  0.000000  0.000000  0.000000  0.000000
 [8]  0.146375  0.000000  0.194500 10.000000

Another approach would be to use aggregate:
Group.1          x
1        1   0.000000
2        2   0.000000
3        3   0.000000
4        4   0.000000
5        5   0.000000
6        6   0.000000
7        7   0.000000
8        8   0.146375
9        9   0.000000
10      10   0.194500
11      11 100.000000

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David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

Thread (5 messages)

Wim Kreinen summarise subsets of a vector Jan 22 arun summarise subsets of a vector Jan 22 Jessica Streicher summarise subsets of a vector Jan 23 David L Carlson summarise subsets of a vector Jan 23 Jessica Streicher summarise subsets of a vector Jan 23