Fwd: Re: [R] legend() with option adj=1

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From: Anna H. Pryor (anna@ptolemy.arc.nasa.gov)
Date: Fri 06 Jun 2003 - 00:20:11 EST


Message-id: <200306050720.11135.anna@ptolemy.arc.nasa.gov>

Is there a simpler way then the solution to the one that was posted here? I'm
not very proficient with legend, and I don't understand this solution. All
I have is two or more lines on one plot that I want to put a legend on and I
can't figure out how to do it from the examples. Can you give a very simple
example? It does not have to be fancy!! I have never worked with a package
where the legend was not automatic.

---------- Forwarded Message ----------

Subject: Re: [R] legend() with option adj=1
Date: Wed, 21 May 2003 09:19:11 +0200
From: Uwe Ligges <ligges@statistik.uni-dortmund.de>
To: Jerome Asselin <jerome@hivnet.ubc.ca>
Cc: r-help@stat.math.ethz.ch

Jerome Asselin wrote:
> Hi there,
>
> I want to justify to right the text of my legend. Consider this short
> reproducable example.
>
> x <- 1:5
> y1 <- 1/x
> y2 <- 2/x
> plot(rep(x,2),c(y1,y2),type="n",xlab="x",ylab="y")
> lines(x,y1)
> lines(x,y2,lty=2)
> legend(5,2,c("1,000","1,000,000"),lty=1:2,xjust=1,yjust=1)
> legend(5,1.5,c("1,000","1,000,000"),lty=1:2,xjust=1,yjust=1,adj=1)
>
> Now, I would like to right-justify the text of the legend. As you can see,
> the option adj=1 does not give satisfactory results.
>
> Is this a bug or is there an easy way that I'm missing?
>
> Thanks,
> Jerome

Works, e.g., with the following little trick:

  x <- 1:5
  y1 <- 1/x
  y2 <- 2/x
  plot(rep(x,2),c(y1,y2),type="n",xlab="x",ylab="y")
  lines(x,y1)
  lines(x,y2,lty=2)
  temp <- legend(5, 2, legend = c(" ", " "),
    text.width = strwidth("1,000,000"), lty = 1:2, xjust = 1, yjust = 1)
  text(temp$rect$left + temp$rect$w, temp$text$y,
     c("1,000", "1,000,000"), pos=2)

See ?legend for details, in particular the returned value.

Uwe Ligges

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