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. Tom -- View this message in context: http://www.nabble.com/Specifying-relative-position-of-text-in-a-plot-tp16002549p16002549.html Sent from the R help mailing list archive at Nabble.com.
Henrique Dallazuanna
2008-Mar-12 14:58 UTC
[R] Specifying relative position of text in a plot
Try this:
plot(rnorm(100))
text(diff(par("usr")[1:2])/10, sum(par("usr")[3:4])/2,
labels="Test")
On 12/03/2008, Tom La Bone <booboo at gforcecable.com>
wrote:>
> 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.
>
> Tom
> --
> View this message in context:
http://www.nabble.com/Specifying-relative-position-of-text-in-a-plot-tp16002549p16002549.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
>
--
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O
Prof Brian Ripley
2008-Mar-12 15:13 UTC
[R] Specifying relative position of text in a plot
See ?par, entry "usr". Either set a new coordinate system and use it,
or
convert 1/10 to user coordinates.
In R-devel (2.7.0 to be) this is easier:
text(grconvertX(0.1,"npc"), grconvertY(0.5, "npc"),
"some text")
cnvrt.coords() in package TeachingDemos does something similar (although
it doesn't use the standard R names for coordinate systems, and there are
more than 5).
On Wed, 12 Mar 2008, Tom La Bone wrote:
>
> 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.
>
> Tom
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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()$usr x <- pu[1] * 0.5 + pu[2] * 0.5 y <- pu[3] * 0.1 + pu[4] * 0.9 text(x, y, "the quick brown fox jumps over a lazy dog") Alberto Monteiro
Nordlund, Dan (DSHS/RDA)
2008-Mar-12 18:25 UTC
[R] Specifying relative position of text in a plot
> -----Original Message----- > From: r-help-bounces at r-project.org > [mailto:r-help-bounces at r-project.org] On Behalf Of Alberto Monteiro > Sent: Wednesday, March 12, 2008 10:28 AM > To: Tom La Bone; r-help at r-project.org > Subject: Re: [R] Specifying relative position of text in a plot > > > Tom La Bone asked: > > > > What is the simplest way to specify the location of text in a > > scatter plot > > (created using the plot function) in relative terms rather than > > specific x-y coordinates? For example, rather than putting text at > > (300,49) on a plot, how do I put it 1/10 of the way over from the y > > axis and 1/2 of the way up from the x axis? Thanks. > > > See the help of par: > ?par > > Namely: > > plot(rnorm(100), rnorm(100)) > pu <- par()$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
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 > > > > ______________________________________________ > 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. >
Prof Brian Ripley
2008-Mar-12 19:01 UTC
[R] Specifying relative position of text in a plot
On Wed, 12 Mar 2008, Nordlund, Dan (DSHS/RDA) wrote:>> -----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] * 0.5Yes, and there has been another wrong answer earlier. Note that my suggestion of plot(rnorm(100), rnorm(100)) op <- par(usr=c(0,1,0,1)) text(1/10, 1/2, "some text") par(op) is a lot less error-prone (and it also works with log scales).> 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.Better, use the adj= argument to text. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
Bill.Venables at csiro.au
2008-Mar-13 00:16 UTC
[R] Specifying relative position of text in a plot
Here is one way.
...
usr <- par("usr") # get user coordinates
par(usr = c(0, 1, 0, 1)) # new relative user coordinates
text(0.1, 0.5, "Some text", adj = 0) # if that's what you want
par(usr = usr) # restore original user coordinates
...
If you were going to be doing this a lot, you could write a simple
wrapper function to text(...) to incorporate this change to relative
coordinates and back again.
Bill Venables
CSIRO Laboratories
PO Box 120, Cleveland, 4163
AUSTRALIA
Office Phone (email preferred): +61 7 3826 7251
Fax (if absolutely necessary): +61 7 3826 7304
Mobile: +61 4 8819 4402
Home Phone: +61 7 3286 7700
mailto:Bill.Venables at csiro.au
http://www.cmis.csiro.au/bill.venables/
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Tom La Bone
Sent: Thursday, 13 March 2008 12:34 AM
To: r-help at r-project.org
Subject: [R] Specifying relative position of text in a plot
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.
Tom
--
View this message in context:
http://www.nabble.com/Specifying-relative-position-of-text-in-a-plot-tp1
6002549p16002549.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
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.