Hi R-users:
I have a data formatting question. I have a data set that looks something like this:
foo.dat <- cbind(c(NA, 1, 2, 3, 4, 5), c(NA, NA, 0, 10 ,20, 30))
What I have:
[,1] [,2]
[1,] NA NA
[2,] 1 NA
[3,] 2 0
[4,] 3 10
[5,] 4 20
[6,] 5 30
I want to line up the columns by the first value that is not NA. Like so:
[,1] [,2]
[1,] 1 0
[2,] 2 10
[3,] 3 20
[4,] 4 30
[5,] 5 NA
[6,] NA NA
Question is: Is there an elegant way to do this without a for loop?
I tried doing this with na.omit and na.exclude without success.
The real data is many hundreds of columns and many thousands of rows.
Thanks in advance, Tim
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