Dear all,
A quick question which I somehow cannto figure out: I want to apply
the function "any" to subsets of a dataset in order to create a vector
with TRUE/FALSE values, depending on whether a subset has the number
5. I.e.,
y <- matrix(c(1,2,3,3,4,5,5,6,6,7,5,1,1,3,5,NA,5,1,1,3),ncol=2)
> y
[,1] [,2]
[1,] 1 5
[2,] 2 1
[3,] 3 1
[4,] 3 3
[5,] 4 5
[6,] 5 NA
[7,] 5 5
[8,] 6 1
[9,] 6 1
[10,] 7 3
## y[,1] is the index, y[,2] the object for which I apply the function.
> tapply(y[,2],y[,1],any,5)
1 2 3 4 5 6 7
TRUE TRUE TRUE TRUE TRUE TRUE TRUE
> tapply(y[,2],y[,1],function(i,x,y) any(x[i]==y),x=y[,2],y=5)
1 2 3 4 5 6 7
TRUE TRUE TRUE TRUE TRUE TRUE FALSE
I want to obtain:
1 2 3 4 5 6 7
TRUE FALSE FALSE TRUE TRUE FALSE FALSE
Thanks!
Stephan
--
-----------------------
Stephan Lindner
University of Michigan
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