# [Rd] ugly in plotmath: frac(1, sqrt(...)) (PR#1101)

**ligges@statistik.uni-dortmund.de
**
ligges@statistik.uni-dortmund.de

*Wed, 3 Oct 2001 12:53:18 +0200 (MET DST)*

ligges@statistik.uni-dortmund.de wrote:
>*
*>* Sometimes (dependent on device and settings of 'cex' and 'lwd') the line
*>* of a square root symbol plottet in the denominator of a fraction appears
*>* to be in or above the line of the fraction.
*>*
*>* Examples:
*>*
*>* ### Choose one of these:
*>* # pdf("test.pdf", height=6, width=8)
*>* # bmp("test.bmp", width=1100, height=800, pointsize=12)
*>* # bitmap("test.tif", type="tiff24nc", width=12, height=9, res=300,
*>* pointsize=12)
*>* # png("test.png", width=1100, height=800, pointsize=12)
*>* # postscript("test.eps", height=6, width=8, horizontal=FALSE)
*>*
*>* par(cex=2, lwd=2)
*>* plot(1:10)
*>* text(2, 8, expression(frac(1, sigma[i]*sqrt(2*pi))))
*>* dev.off()
*
After some investigations:
In plotmath.c, line 2250 the "the gap between the nucleus and the
radical extension" is defined:
#define RADICAL_GAP 0.4
It looks like this gap is not added to the hight (or included in the
calculations of the hight) of the denominator of a fraction. So the
whole denominator is located to close to the fraction bar, if a root is
drawn.
I don't see, how this can be fixed smartly ...
Uwe Ligges
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