[R] Specifying relative position of text in a plot

[Greg Snow]

To left justify the text rather than center, use the adj argument, this
is easier and probably more reliable than trying to adjust the x
coordinate manually.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Nordlund, 
> Dan (DSHS/RDA)
> Sent: Wednesday, March 12, 2008 12:26 PM
> To: Alberto Monteiro; Tom La Bone; r-help at r-project.org
> Subject: Re: [R] Specifying relative position of text in a plot
> 
> > -----Original Message-----
> > From: r-help-bounces at r-project.org
> > [mailto:r-help-bounces at r-project.org] On Behalf Of Alberto Monteiro
> > Sent: Wednesday, March 12, 2008 10:28 AM
> > To: Tom La Bone; r-help at r-project.org
> > Subject: Re: [R] Specifying relative position of text in a plot
> > 
> > 
> > Tom La Bone asked:
> > >
> > > What is the simplest way to specify the location of text in a 
> > > scatter plot (created using the plot function) in relative terms 
> > > rather than specific x-y coordinates? For example, rather than 
> > > putting text at
> > > (300,49) on a plot, how do I put it 1/10 of the way over 
> from the y 
> > > axis and 1/2 of the way up from the x axis? Thanks.
> > > 
> > See the help of par:
> > ?par
> > 
> > Namely:
> > 
> > plot(rnorm(100), rnorm(100))
> > pu <- par()$usr
> > x <- pu[1] * 0.5 + pu[2] * 0.5
> > y <- pu[3] * 0.1 + pu[4] * 0.9
> > text(x, y, "the quick brown fox jumps over a lazy dog")
> > 
> > Alberto Monteiro
> > 
> 
> This is a useful example of placing text, but I interpreted 
> the request as aking for the text to be placed at the left 
> side of the graph (1/10 of the x range) and centered 
> vertically (with respect to the y scale).  So, then I would 
> calculate x and y as
> 
> x <- pu[1] * 0.9 + pu[2] * 0.1
> y <- pu[3] * 0.5 + pu[4] * 0.5
> 
> Also, text() centers the supplied text at the x,y 
> coordinates. So, if Tom wants the text "begin" at that point, 
> he will need to adjust the x coordinate for the length of the 
> string being printed.
> 
> Hope this is helpful,
> 
> Dan
> 
> Daniel J. Nordlund
> Research and Data Analysis
> Washington State Department of Social and Health Services 
> Olympia, WA  98504-5204
>  
>  
> 
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