[R] Conditional operation on multiple columns from two data frames
tsippel at gmail.com
Mon Dec 29 01:27:01 CET 2008
The suggestion below was made.
df1$Date <- as.Date(df1$Date)
df2$Date <- as.Date(df2$Date)
ifelse(df1$ID==df2$ID & df1$Date-df2$Date<0.5,df1$y-df2$y, NA)
However, because my dataframe rows do not align, I need the conditionals to
be tested on every combination of cells. I'm starting to think I need to
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