Message-ID: <200508291811.12899.tamir@imp.univie.ac.at>
Date: 2005-08-29T16:11:12Z
From: Ido M. Tamir
Subject: reexpand a matrix after subsetting
Hi,
suppose I have a matrix (or dataframe)
as a result from subsetting.
mat <- matrix(1:20,ncol=2)
mat[c(3,6,9),] <- NA
cc <- complete.cases(mat)
sub <- mat[cc,,drop=FALSE]
sub <- sub * 2
#some caluculations with sub.
now I would like to expand sub somehow
so row 3,6, and 9 would be filled with
NAs but the rest should be in place again.
Is there a simple function for this?
merge is not an option.
Thank you very much for your help.
Ido
[,1] [,2]
[1,] 2 22
[2,] 4 24
[3,] NA NA
[4,] 8 28
[5,] 10 30
[6,] NA NA
[7,] 14 34
[8,] 16 36
[9,] NA NA
[10,] 20 40