[R] problem with levels in dataframes

tomsv193@student.liu.se tomsv193 at student.liu.se
Mon Jul 2 11:13:43 CEST 2001


I am reading from one data.frame and writing to antoher (that is: data-
transfer...). Sometimes the value transferred is NA. I use the 
following line (i and j are well defined!):


I recieve this warning:
invalid factor level, NAs generated in: [<-.factor(*tmp*, i, value = 0)

What does this mean? The data.frames are read from files (and these 
files are saved with write.table(...,quote=FALSE). 

/Tomas Svensson
WinNT, R 1.2.3

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