[R] How to get the n (number of observations) per conditional group

[Dax]

I found a work-around by just simply getting the sum of the
conditional values and dividing this by the mean. It's not elegant but
it works

On Aug 13, 3:11 pm, Dax <rienk.doet... at gmail.com> wrote:
> Hello all,
>
> I have a huge data set that I'm cleaning up a bit. I am extracted the
> means per condition, but also need to get the n. Strangely enough I am
> unable to find a function that could actually pull this off. I am
> unable to use replications or count the rows using nrow.
>
> What I am trying to obtain is the number of observations fitting
> something along the lines of "data$total[data$spp==1&data$gyro==1&data
> $salinity==0&data$day==i]"
>
> Can anyone help me?
>
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