On Tue, Apr 19, 2011 at 03:29:08PM +0800, Tim Elwell-Sutton wrote:
> Dear all
>
>
>
> I have written a function to perform a very simple but useful task which I
> do regularly. It is designed to show how many values are missing from each
> variable in a data.frame. In its current form it works but is slow because I
> have used several loops to achieve this simple task.
Why not use summary?
> foo <- data.frame(a=c(1,3,4,NA), b=c(NA,4,NA,8), c=factor(c('A', NA, 'A',
> 'B')))
> summary(foo)
a b c
Min. :1.000 Min. :4 A :2
1st Qu.:2.000 1st Qu.:5 B :1
Median :3.000 Median :6 NA's:1
Mean :2.667 Mean :6
3rd Qu.:3.500 3rd Qu.:7
Max. :4.000 Max. :8
NA's :1.000 NA's :2
cu
Philipp
--
Dr. Philipp Pagel
Lehrstuhl für Genomorientierte Bioinformatik
Technische Universität München
Wissenschaftszentrum Weihenstephan
Maximus-von-Imhof-Forum 3
85354 Freising, Germany
http://webclu.bio.wzw.tum.de/~pagel/
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