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gague
2006 Dec 26
2
sequential row selection in dataframe
Dear all;
I'm wondering if there is any 'efficient' approach for selecting a
sample of 'every nth rows' from a dataframe. For example, let's use
the dataframe GAGurine in MASS library:
> length(GAGurine[,1])
[1] 314
# select an 75% of the dataset, i.e. = 236 rows, every 2 rows starting
from row 1
> test<-GAGurine[seq(1,314,2),]
> length(test[,1])
[1] 157
#