Your use of HTML email corrupted your example slightly, but I was able to
fix it. Please follow the Posting Guide and set your emails to Plain Text
mode when posting to this mailing list in the future.
Here is one way:
# you have to be careful about mucking with factors
# convert columns to fa
Marine:
Thanks for the reproducible example. I would not have fooled with this
otherwise!
1. First note that your specification that you wish to replace only
those values in col3 and col4 of df1 that don't match with those of
df2 is irrelevant: if you replace those that do match you don't change
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