[R] Replacing data from one data frame to another
ggrothendieck at myway.com
Wed Oct 20 05:54:34 CEST 2004
Check out the merge command.
From: Neil Leonard <nleonard at tartarus.uwa.edu.au>
I have a data frame which contains two fields, 'prev' and 'mchnum'.
I have another data frame which also contains 'mchnum' and 'prev' and
some other fields. The 'prev' data in this field is corrupted and I
want to replace it with the data from the other data frame for matching
values of 'mchnum' (which are unique). Is there an easier way of doing
this than having two for loops and going through each field looking for
matching values of 'mchnum' and then replacing the 'prev' value when
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