Hi,
try adding asp=1 in symbols() to set the aspect ratio of the plotting
region to 1.
HTH,
baptiste
On 17 July 2010 18:21, nancy...@gmail.com wrote:
Hello, I submitted this bug report to r-core and got a rejection saying I
should post to r-help.
This is my first time ever submitting a bug report, so forgive me if I'm
using some wrong format.
So, here's my bug report:
Component: Graphics
OS: Mac OS 10.5.8, X11 XQuartz 2.5.0
Summary:
In the symbols function of the graphics package, scaling of the y-axis is
wrong, causing symbols that should be separate to overlap in the y-direction
(x-direction is okay).
Description:
Attached is a plot that should be of circles of radius 5 spaced exactly with
their centers 10 apart in both x and y directions, so that they should be
packed with the circles touching edge-to-edge. In the y-direction, somehow
the
plotting scale is wrong such that the circles overlap. I've plotted
horizontal
and vertical lines at x=45,50,55, and y=45,50,55, as well as two squares
with
side=10. The squares are also overlapping in the vertical scale.
Steps to reproduce:
Here are the commands I used to generate this:
maptrees = function(n=1,a=1,b=1,h=2,view=horz,fg=1,np=FALSE,add=TRUE) {
#n = tree density (#/m2)
#a = crown horizontal radius (m)
#b = crown vertical radius (m)
#h = tree height (m)
#view = horz, vert
#np = TRUE if new plot desired
if (np) {
quartz(width=6, height=6)
add=!np
}
dx = sqrt(1/n)
x = rep(dx*(1:10),10)
y = as.vector(t(matrix(x,10,10)))
if (view==horz) {
circles = rep(a,100)
symbols(x=x,y=y,circles=circles, fg=fg,inches=FALSE,add=add)
points(x,y,pch='.')
mtext(paste(n=,n,, d=,dx,, a=,a))
} else {
#mtext(paste(n=,n,, d=,dx,, a=,a,, b=,b,, h=,h))
}
return(cbind(x,y,circles))
}
Commands:
junk =maptrees(n= 0.01, a=5,add=FALSE)
lines(c(0,100),c(45,45))
lines(c(0,100),c(55,55))
lines(c(0,100),c(50,50))
lines(c(50,50),c(0,100))
lines(c(55,55),c(0,100))
lines(c(45,45),c(0,100))
symbols(50,50,squares=10,fg=2, add=TRUE,inches=FALSE)
symbols(50,60,squares=10,fg=2, add=TRUE,inches=FALSE)
Actual results: See attached plot.
Expected results: The circles and squares in the plot should be
edge-to-edge,
not overlapping in the vertical direction.
Build Date and Platform: Build 2010-7-16 on Mac 10.5.8
I am using a MacBookPro:
platform x86_64-apple-darwin9.8.0
arch x86_64
os darwin9.8.0
system x86_64, darwin9.8.0
status
major 2
minor 11.1
year 2010
month 05
day 31
svn rev 52157
language R
version.string R version 2.11.1 (2010-05-31)
I could not find another bug report of this problem.
Thanks to anyone who can help.
Nancy Kiang
--
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Dr. Baptiste Auguié
Departamento de Química Física,
Universidade de Vigo,
Campus Universitario, 36310, Vigo, Spain
tel: +34 9868 18617
http://webs.uvigo.es/coloides
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
