modify a data frame by values in the columns
On 2011-06-03 13:34, Jason024 wrote:
I have a data frame like this:
col1 col2
r1 2 1
r2 4 3
r3 6 5
r4 8 7
r5 10 9
r6 12 11
r7 14 13
r8 16 15
r9 18 17
r10 20 19
I want to modify this data frame, for example, assign every row in column
col1 and col2 to -1 if the values in col1 is less than 12 and values in col2
is greater than 10. The result should look like this:
col1 col2
r1 -1 1
r2 -1 3
r3 -1 5
r4 -1 7
r5 -1 9
r6 12 -1
r7 14 -1
r8 16 -1
r9 18 -1
r10 20 -1
I have been struggling to make it to work. Any help is appreciated!
This seems made for within(); calling your data.frame 'd':
d.new <- within(d, {
col1 <- ifelse(col1 < 12, -1, col1)
col2 <- ifelse(col2 > 10, -1, col2)
})
Peter Ehlers
Jason -- View this message in context: http://r.789695.n4.nabble.com/modify-a-data-frame-by-values-in-the-columns-tp3571995p3571995.html Sent from the R help mailing list archive at Nabble.com.
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