tsippel wrote:
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
I'd look at outer() or try a merge() before the operation to get things
aligned. It is not clear to me what form of output you desire if you
look at "every combination of cells".
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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