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comnew
2006 Oct 02
1
separation depending on equal contents in more than one field
...(1,2,3,4,4,5), c=1:2))
attach(obs)
In reality its about 1 million rows.
Some of the datasets have same contents in col a and! b like row 4 and 5.
I want to do some calculations on col c within the duplicated rows and
merge them afterwards:
layer <- function(x) round((1-prod(1-x/100))*100,0)
(covnew <- aggregate(c, list(a=a, b=b), layer))
This works fine, but not with 1 mill. rows because of memory space
limitations.
So I thought to split the dataframe into the majority of unique rows on
one hand and all duplicated rows on the other:
With
subset(obs, a %in% a[duplicated(a)])
and !a resp...