Red the help page for merge:
?merge
On Jun 17, 2009, at 8:33 PM, Martin Batholdy wrote:
hi,
I have two data.frames each with two columns;
x1
1 4
1 3
1 6
2 9
2 2
2 5
3 6
3 7
3 4
x2
1 -3
1 -7
2 -3
2 -2
2 -8
3 -1
3 -2
3 -1
now I want to merge this data.frames to one data.frame.
The problem is, that sometimes there is a different number of
elements per category.
(like above x1 has 3 values for the value 1 in the first row, but x2
has only 2 values for the value 1 in the first row).
Is there an easy way to merge this two data.frames by deleting the
rows that only one data.frame "has".
In the example, that resulting data.frame would be the data.frame x1
and x2 except the row 3 of data.frame x1.
thanks for any suggestions!
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______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
