Hi Martin,

Try

x=c(NA,NA,rnorm(50),NA)
sum(!is.na(x))

HTH

Jorge


On Thu, Mar 6, 2008 at 11:41 AM, Martin Kaffanke <technik@roomandspace.com>
wrote:

> Hi there,
>
> When i do
>
> mean(fl[1:20], na.rm=T)
> sd(fl[1:20], na.rm=T)
>
> I get 20 Results, but now I'd like to know from how many numbers my mean
> and sd are calculated.
>
> How to I use the length() for this, or is this possible?
>
> Because there are missing values in some, but not in all columns.  So
> there should be a different count of numbers.
>
> Thanks,
> Martin
>
> --
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