R help - Jan 2001 - dotplot: character size of labels

Dear R users,

using dotplot (R1.2.0, WinNT4.0), I am trying to change the character size
of the labels of the points:
> # example
> data(VADeaths)
> dotplot(VADeaths, main = "Death Rates in Virginia - 1940")
> # I'd like to have smaller character size of the labels (for age and
population groups)
> ?dotplot
> # for argument "cex", this says: "Setting cex to a value
smaller than one
can be a useful way of avoiding label overlap."
> dotplot(VADeaths, main = "Death Rates in Virginia - 1940", cex =
0.5)
> # the main title and the plotting characters are smaller now, but not the
labels
> # trying to set other graphics parameters seems to have no effect:
> dotplot(VADeaths, main = "Death Rates in Virginia - 1940",
cex.axis = 0.5)
> dotplot(VADeaths, main = "Death Rates in Virginia - 1940",
cex.lab = 0.5)
I'd be grateful for any hint how to do this correctly;

regards,

Heinrich.
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On Thu, 18 Jan 2001, RINNER Heinrich wrote:
> Dear R users,
>
> using dotplot (R1.2.0, WinNT4.0), I am trying to change the character size
> of the labels of the points:
>
> > # example
> > data(VADeaths)
> > dotplot(VADeaths, main = "Death Rates in Virginia - 1940")
> > # I'd like to have smaller character size of the labels (for age
and
> population groups)
> > ?dotplot
> > # for argument "cex", this says: "Setting cex to a
value smaller than one
> can be a useful way of avoiding label overlap."
> > dotplot(VADeaths, main = "Death Rates in Virginia - 1940",
cex = 0.5)
> > # the main title and the plotting characters are smaller now, but not
the
> labels
> > # trying to set other graphics parameters seems to have no effect:
> > dotplot(VADeaths, main = "Death Rates in Virginia - 1940",
cex.axis = 0.5)
> > dotplot(VADeaths, main = "Death Rates in Virginia - 1940",
cex.lab = 0.5)
>
> I'd be grateful for any hint how to do this correctly;
Looks like a bug. Inside dotplot alter to

        for (i in 1:n) mtext(labs[i], side = 2, line = loffset,
            at = y[i], adj = 0, col = color, las = 2, cex = cex, ...)

        for (i in 1:nlevels(groups)) mtext(glabels[i], side = 2,
            line = goffset, at = gpos[i], adj = 0, col = gcolor,
            las = 2, cex = cex, ...)

However, it really needs more than that to calculate the spaces for the
labels correctly.


-- 
Brian D. Ripley,                  ripley at 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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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RINNER Heinrich wrote:
> 
> Dear R users,
> 
> using dotplot (R1.2.0, WinNT4.0), I am trying to change the character size
> of the labels of the points:
> 
> > # example
> > data(VADeaths)
> > dotplot(VADeaths, main = "Death Rates in Virginia - 1940")
> > # I'd like to have smaller character size of the labels (for age
and
> population groups)
> > ?dotplot
> > # for argument "cex", this says: "Setting cex to a
value smaller than one
> can be a useful way of avoiding label overlap."
> > dotplot(VADeaths, main = "Death Rates in Virginia - 1940",
cex = 0.5)
> > # the main title and the plotting characters are smaller now, but not
the
> labels
> > # trying to set other graphics parameters seems to have no effect:
> > dotplot(VADeaths, main = "Death Rates in Virginia - 1940",
cex.axis = 0.5)
> > dotplot(VADeaths, main = "Death Rates in Virginia - 1940",
cex.lab = 0.5)
> 
> I'd be grateful for any hint how to do this correctly;

You have to add "cex = cex" in the mtext() calls in the function
dotplot():

63-64:
        for (i in 1:n) mtext(labs[i], side = 2, line = loffset, 
            at = y[i], adj = 0, col = color, las = 2, cex = cex,...)

73-75:
 for (i in 1:nlevels(groups)) mtext(glabels[i], side = 2, 
            line = goffset, at = gpos[i], adj = 0, col = gcolor, 
            las = 2, cex = cex, ...)


Uwe Ligges
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