Hello,
It's difficult to know what's going on without a data example. Can you
post the output of
dput(head(data, 30))
?
Maybe the columns are not of class "character" but of class "factor".
You should also post the output of
str(data)
In the mean time, try
subset(data, column1 != "a" & column2 != "b")
Hope this helps,
Rui Barradas
Em 09-05-2013 17:28, KatrinH Heimann escreveu:
Dear all,
I would like to subset a dataframe using multiple conditions.
So if I have two columns 1 and 2, I would like to EXCLUDE all rows in which
the value of column 1 is "a" AND the value of column 2 is "b".
I tried data[(data$column1 != "a" & data$column2 != "b"),] but that deletes
me every row in which either 1 is "a" or 2 is "b".
Any ideas?
Thanks so much
K
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