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Conditional operation on multiple columns from two data frames

Tim Sippel 
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
use tapply?  

Tim

Thread (5 messages)

Tim Sippel Conditional operation on multiple columns from two data frames Dec 27 Tim Sippel Conditional operation on multiple columns from two data frames Dec 27 Tim Sippel Conditional operation on multiple columns from two data frames Dec 28 Peter Dalgaard Conditional operation on multiple columns from two data frames Dec 28 jim holtman Conditional operation on multiple columns from two data frames Dec 28