[R] problem using "rank"

[Prof Brian Ripley]

On Fri, 17 Aug 2007, Jiong Zhang, PhD wrote:

> Hi All,
>
> I had 12766 elements in a column, 12566 are values and 200 are "NA"s. I 
> used the following line to get the ranks:
>
> total_list$MB.rank <- rank(-total_list$MB,ties.method="min",na.last=NA)
>
> but I got an error message:
>
> Error in `$<-.data.frame`(`*tmp*`, "BCRP_PW_F.rank", value = c(3949, 6182,  :
>        replacement has 12199 rows, data has 12766
>
> What shall I do to keep the "NA"s as "NA"s?  thanks a lot.

If all else fails try reading the help!  You have to select the right 
option for na.last, and yours is not it.  I suspect you want 
na.last="keep", but only you know what you mean.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595