R help - Nov 2008 - Changing the position of the origin

Hi all,

Can anyone tell me how I can make 0,0 start at the top left hand
corner of a graph, instead of the typical lower left hand corner? I've
tried to plot with axes=F and then putting on the axes later, but I
want the points to correspond to the axes.

Thanks,
Kang Min

Hi, I don't understand the question. If your data is in the fourth quadrant
(all positive Xs, all negative Ys) this will happen automatically as the
standard R plot plots only in the range where there is data, e.g.

x=rnorm(100,0,1)
e=rnorm(100,0,1)
y=-abs(x)-abs(e)
plot(y~x,bty="n")

Please be more precise about your question.

Cheers,
Daniel

-------------------------
cuncta stricte discussurus
-------------------------

-----Urspr?ngliche Nachricht-----
Von: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Im
Auftrag von Plantky
Gesendet: Monday, November 17, 2008 11:46 PM
An: r-help at r-project.org
Betreff: [R] Changing the position of the origin

Hi all,

Can anyone tell me how I can make 0,0 start at the top left hand corner of a
graph, instead of the typical lower left hand corner? I've tried to plot
with axes=F and then putting on the axes later, but I want the points to
correspond to the axes.

Thanks,
Kang Min

______________________________________________
R-help at r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Plantky wrote:
> Hi all,
> 
> Can anyone tell me how I can make 0,0 start at the top left hand
> corner of a graph, instead of the typical lower left hand corner? I've
> tried to plot with axes=F and then putting on the axes later, but I
> want the points to correspond to the axes.
> 
> Thanks,
> Kang Min
Does this what you want?

x <-  runif(10)
y <- -runif(10)

plot(x, y, xlim=c(0, max(x)), ylim=c(min(y), 0), axes=FALSE)
axis(2)
axis(3)
box()

Thomas P.

If I understand what you're seeking to do, you might also consider the
rplot() function written by Rolf Turner.  It can be found at

http://tolstoy.newcastle.edu.au/R/help/02a/1174.html


Benjamin


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Plantky
Sent: Monday, November 17, 2008 11:46 PM
To: r-help at r-project.org
Subject: [R] Changing the position of the origin

Hi all,

Can anyone tell me how I can make 0,0 start at the top left hand
corner of a graph, instead of the typical lower left hand corner? I've
tried to plot with axes=F and then putting on the axes later, but I
want the points to correspond to the axes.

Thanks,
Kang Min

______________________________________________
R-help at 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.



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Hi Kang,
As well as Benjamin's solution, Rolf kindly contributed the function to 
the plotrix package, where is it known as "revaxis".

Jim