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sab
2011 Jan 19
0
$ operator is invalid for atomic vectors
...#39;Group A', 'Group A', 'Group C', 'Group B', 'Group
C'), gender=c(1,1,1,2,2))
subset(sab, sab$group=='Group A')
Perhaps your data is stored as a matrix? If so, the following code will fail
with the error message you experienced.
# Non Working Example
sab2 = matrix(c('Group A', 'Group A', 'Group C', 'Group B', 'Group
C',1,1,1,2,2),5,2)
subset(sab2, sab2$group=='Group A')
HTH
Pete
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