Extending each element in a list, or rbind()-ing arrays of different length without recycling

Fri, Feb 13, 2009 9:49 AM

Combining the various approaches on the list, here's a simple
one-liner that puts the NAs at the end:

     t(apply(mat,1,function(r) { dr<-duplicated(r); c( r[!dr],
rep(NA,sum(dr)) ) ))

If you don't care where the NAs are, the following is a tad shorter
and perhaps clearer:

     mat[ t(apply(mat,1,duplicated)) ] < -NA                  # modifies mat

         -s

Thread (6 messages)

Mark Leeds Extending each element in a list, or rbind()-ing arrays of different length without recycling Feb 12 Rolf Turner Extending each element in a list, or rbind()-ing arrays of different length without recycling Feb 12 Berwin A Turlach Extending each element in a list, or rbind()-ing arrays of different length without recycling Feb 12 Stavros Macrakis Extending each element in a list, or rbind()-ing arrays of different length without recycling Feb 13 Stavros Macrakis Extending each element in a list, or rbind()-ing arrays of different length without recycling Feb 13 Gabor Grothendieck Extending each element in a list, or rbind()-ing arrays of different length without recycling Feb 13