[R] Extracting data using subset function

[Rolf Turner]

On Sun, 5 Feb 2023 15:13:54 -0500
Duncan Murdoch <murdoch.duncan using gmail.com> wrote:

<SNIP>
> 
> Just to build the mountain a little higher, I would use
> 
>    subset(p, seq_along(p) <= 20)
> 
> You should generally avoid expressions like "1:length(p)", because
> they don't do what you would expect in the unusual case that p is
> length 0.
> 
> Even in cases where you know p is not length 0, it's a good habit to
> get into so that in the future you don't get surprised.

Aaarrrggghhh.  That was a dumb-dumb on my part.  As Burns said to
Ripley (fortunes::fortune(26)), good catch.

Thanks.

cheers,

Rolf

-- 
Honorary Research Fellow
Department of Statistics
University of Auckland
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