[R] Matrix formatting

[Roger Peng]

Is

apply(foo.dat, 2, sort, na.last = TRUE)

what you want?

-roger
_______________________________
UCLA Department of Statistics
rpeng at stat.ucla.edu
http://www.stat.ucla.edu/~rpeng

On 12 Feb 2003, Tim Sharac wrote:

> 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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