[R] Simple Lookup... why so slow

Dieter Menne dieter.menne at menne-biomed.de
Fri Aug 6 17:10:31 CEST 2004


thanks for your phantastic summary. Solution 5 is the version I was looking
for, but I left out the cbind in good old c-fashion.

> # Solution 5 : Vectorised operation with list extractor
> system.time( ee <- PatDay$Day - StartDay[ cbind(PatDay$Treat,PatDay$Pat)


More information about the R-help mailing list