R help - Jun 2006 - slanted ends of horizontal lines for certain line widths

Hello,

if I plot a horizontal line, e.g.,

  plot(c(1,2),c(1,1),xlim=c(0,3),lwd=2,type="l")

or

  plot(c(1,2),c(1,1),xlim=c(0,3),lwd=4,type="l")

then the left end (1st example) or both ends (2nd example) of the lines
are not rectangular but slanted on the graphical display (screen).
That behavour first occurred when I was trying to plot a stepfun, e.g.,

y <- round(rnorm(12),1)
Fn12 <- ecdf(y)
plot(Fn12,verticals= FALSE, do.p = FALSE,lwd=2,col.h="red")
plot(Fn12,verticals= FALSE, do.p = FALSE,lwd=4,col.h="red")

(lwd=3 seems okay)

Bug or feature?
Suggestions? (I don't like the slanted ends but lwd=2 would be better
than lwd=3)

Robert Offinger
OvG-Universit?t Magdeburg

----
platform       sparc-sun-solaris2.9
arch           sparc
os             solaris2.9
system         sparc, solaris2.9
status
major          2
minor          3.1
year           2006
month          06
day            01
svn rev        38247
language       R
version.string Version 2.3.1 (2006-06-01)

I think you want to change par()$lend

Type 

par()  <enter>

to see the defaults.

In your situation you might want to begin with something like

dev.off()
par(mar=c(4,6,4,5)+0.1, lend=2)
... then your plotting logic ...

Where the "mar" argument adjusts the margins.  (You can omit this if
you're
happy with the defaults.)  And the line end, lend=2, makes the ends square.

Best wishes.

Charles Annis, P.E.

Charles.Annis at StatisticalEngineering.com
phone: 561-352-9699
eFax:  614-455-3265
http://www.StatisticalEngineering.com
 
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Robert Offinger
Sent: Sunday, June 04, 2006 11:24 AM
To: r-help at stat.math.ethz.ch
Subject: [R] slanted ends of horizontal lines for certain line widths

Hello,

if I plot a horizontal line, e.g.,

  plot(c(1,2),c(1,1),xlim=c(0,3),lwd=2,type="l")

or

  plot(c(1,2),c(1,1),xlim=c(0,3),lwd=4,type="l")

then the left end (1st example) or both ends (2nd example) of the lines
are not rectangular but slanted on the graphical display (screen).
That behavour first occurred when I was trying to plot a stepfun, e.g.,

y <- round(rnorm(12),1)
Fn12 <- ecdf(y)
plot(Fn12,verticals= FALSE, do.p = FALSE,lwd=2,col.h="red")
plot(Fn12,verticals= FALSE, do.p = FALSE,lwd=4,col.h="red")

(lwd=3 seems okay)

Bug or feature?
Suggestions? (I don't like the slanted ends but lwd=2 would be better
than lwd=3)

Robert Offinger
OvG-Universit?t Magdeburg

----
platform       sparc-sun-solaris2.9
arch           sparc
os             solaris2.9
system         sparc, solaris2.9
status
major          2
minor          3.1
year           2006
month          06
day            01
svn rev        38247
language       R
version.string Version 2.3.1 (2006-06-01)

______________________________________________
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PLEASE do read the posting guide!
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probably you want to look at the `lend' argument of ?par, e.g.,

op <- par(lend = 2)
plot(c(1,2), c(1,1), xlim = c(0,3), lwd = 20, type = "l")
par(op)

I hope it helps.

Best,
Dimitris

---- 
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


Quoting Robert Offinger <rooff at merkur.math.uni-magdeburg.de>:
> Hello,
> 
> if I plot a horizontal line, e.g.,
> 
>   plot(c(1,2),c(1,1),xlim=c(0,3),lwd=2,type="l")
> 
> or
> 
>   plot(c(1,2),c(1,1),xlim=c(0,3),lwd=4,type="l")
> 
> then the left end (1st example) or both ends (2nd example) of the
> lines
> are not rectangular but slanted on the graphical display (screen).
> That behavour first occurred when I was trying to plot a stepfun,
> e.g.,
> 
> y <- round(rnorm(12),1)
> Fn12 <- ecdf(y)
> plot(Fn12,verticals= FALSE, do.p = FALSE,lwd=2,col.h="red")
> plot(Fn12,verticals= FALSE, do.p = FALSE,lwd=4,col.h="red")
> 
> (lwd=3 seems okay)
> 
> Bug or feature?
> Suggestions? (I don't like the slanted ends but lwd=2 would be
> better
> than lwd=3)
> 
> Robert Offinger
> OvG-Universit?t Magdeburg
> 
> ----
> platform       sparc-sun-solaris2.9
> arch           sparc
> os             solaris2.9
> system         sparc, solaris2.9
> status
> major          2
> minor          3.1
> year           2006
> month          06
> day            01
> svn rev        38247
> language       R
> version.string Version 2.3.1 (2006-06-01)
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
> 
> 

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm