[R] matching multiple fields from a matrix
jcrowley2 at mtech.edu
Mon Apr 15 23:07:20 CEST 2013
I have been trying many ways to match 2 separate fields in a matrix. Here is
a simplified version of the matrix:
site1 depth1 year1 site2 depth2 year2
10 30 1860 NA NA NA
NA NA NA 50 30 1860
Basically I am trying to identify the sites which have a common year and
depth from 2 datasets. What I would like to do is match all of the year1
field to year2 field and the depth1 field and to depth2 field. Then I would
like to output site1, site2, depth, and year.
I have been trying if loops, which(), isTRUE(), etc. but I have not come up
with anything that works.
Any help would be greatly appreciated.
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