[R-pkg-devel] R graphics 'text' package 'adj' parameter order wrong incorrect reversed?

[David Hugh-Jones]

Perhaps the documentation could be clearer, though. (I've been confused by
it also.) How about:

adj allows adjustment of the text with respect to (x, y). Values of 0, 0.5
and 1 specify that text will appear right of/above, centred around, and
left of/below the anchor point,  respectively.

On Wed, 19 Sep 2018 at 08:31, peter dalgaard <pdalgd using gmail.com> wrote:

> Exactly. And left alignment means that the left end of the text is aligned
> with the anchor point, etc. So documentation is correct.
>
> -pd
>
> > On 19 Sep 2018, at 01:33 , Jim Lemon <drjimlemon using gmail.com> wrote:
> >
> > Hi Simon,
> > I think the conventions of typesetting are to blame. Think of an
> > invisible box around the text being displayed.
> > __________________
> > |Left justification          |
> > |-----------------------------|
> > meaning that the text _starts_ at the left of the field and is to the
> > right of the text position specified
> > __________________
> > |        Right justification|
> > |-----------------------------|
> >
> > meaning that the text _ends_ at the right of the field and is to the
> > left of the text position. Can't do the top and bottom justification
> > this way, but I think you get the idea.
> >
> > Jim
> >
> > On Wed, Sep 19, 2018 at 9:13 AM Simon Dedman <simondedman using gmail.com>
> wrote:
> >>
> >> Original stack overflow post here:
> >>
> https://stackoverflow.com/questions/52194719/r-graphic-text-package-adj-parameter-order-wrong-incorrect-reversed
> >>
> >> Hopefully this is now the appropriate place to post this as the above
> post
> >> got a single comment of agreement.
> >>
> >> Content:
> >>
> >> I believe R core package graphics text function's adj parameter is
> >> incorrectly described in the manual
> >> <https://stat.ethz.ch/R-manual/R-devel/library/graphics/html/text.html>
> and
> >> would be grateful if someone could confirm this before I submit a bug
> report
> >> <https://www.r-project.org/bugs.html>.
> >>
> >> adj text:
> >>
> >> adj allows adjustment of the text with respect to (x, y). Values of 0,
> 0.5,
> >> and 1 specify left/bottom, middle and right/top alignment, respectively.
> >>
> >> Since text controls these labels and not the points which have already
> been
> >> plotted, I can't see how "with respect to x,y" can mean anything other
> than
> >> "in this direction relative to their points".
> >>
> >> However the order is reversed: 0,0 (supposedly left & bottom) is top &
> >> right; 1,1 (supposedly right & top) is left and bottom.
> >>
> >> Reproducible example:
> >>
> >> tens = 1:10
> >> plot(tens, tens, xlab = "adj 0,0 left/bottom")
> >> text(tens, tens, labels = letters[tens], adj = c(0,0))
> >> plot(tens, tens, xlab = "adj 0.5,0.5 middle")
> >> text(tens, tens, labels = letters[tens], adj = c(0.5,0.5))
> >> plot(tens, tens, xlab = "adj 1,1 right/top")
> >> text(tens, tens, labels = letters[tens], adj = c(1,1))
> >>
> >> Thanks.
> >>
> >>        [[alternative HTML version deleted]]
> >>
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> >> https://stat.ethz.ch/mailman/listinfo/r-package-devel
> >
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>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
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