Re: [Rd] text(x, y, labels) - recycling problems and RFC (PR#7084)

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Fri 20 Aug 2004 - 02:50:13 EST


On Thu, 19 Aug 2004 maechler@stat.math.ethz.ch wrote:

> I didn't get any feedback on this posting,
>
> so I will commit my proposal to recycle the coordinates (x,y) to
> the length of 'labels' if the latter is longer (instead of
> silently dropping the extra labels[] entries).

I'd suggest only doing non-fractional recycling (or at the very least warning against fractional recycling). I would expect almost all occurrences of your example would be unintended.

>
> Martin Maechler
>
> >>>>> "MM" == Martin Maechler <maechler@stat.math.ethz.ch>
> >>>>> on Tue, 13 Jul 2004 18:22:05 +0200 (CEST) writes:
>
> MM> Not a bug necessarily, in text(), but at least an inconsistency,
> MM> and a need for more documentation: Contrary to e.g., plot(),
> MM> text(x,y,labels) *does* recycle it's arguments to some extent --
> MM> and probably has always in S.
>
> MM> However it doesn't do all I think it should, i.e.,
>
> MM> plot(1:7); text(1:2, 1+ 1:3, LETTERS[1:4])
>
> MM> does recycle 'x' to c(1:2, 1) {length 3} to match 'y'
> MM> but doesn't recycle to length 4 in order to match 'labels'.
>
> MM> While one can well accept this, I believe it should give a
> MM> warning since it silently 'drops' the "d".
>
> MM> However, I'm proposing to consider S(-plus) compatibility here.
> MM> In S-PLUS 6.1, the result of the above is
> MM> identical to
> MM> plot(1:7); text(rep(1:2,length=4), rep(1+ 1:3, length=4), LETTERS[1:4])
> MM> i.e. (x,y) is recycled to length 4, the length of 'labels'.
>
> MM> Further note that in
> MM> plot(1:7); text(1:2, 1+ 1:3, LETTERS[1:2], col=2:6)
> MM> the 'labels' *are* recycled to length 3, matching (x,y) -- but
> MM> not to length 5 of 'col' which is fine -- just not the other way around.
>
> MM> I'd propose that R should recycle all three (x,y,labels)
> MM> [but not more] to common length.
>
> MM> BTW, "grid" graphics do recycle as well, at least
> MM> grid.text(labels, x, y) does --- and as I see it does also
> MM> recycle at least the 'rotation'.
>
> MM> Martin Maechler
>
> MM> ______________________________________________
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> MM> https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
>
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-- 
Brian D. Ripley,                  ripley@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

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Received on Fri Aug 20 03:11:10 2004

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