[R] distance between legend title and legend box

[David Barron]

I don't know if there is a nice, easy way of doing this, but this
method will work:

with(iris,
      plot(Sepal.Length, Sepal.Width,
           pch=as.numeric(Species), cex=1.2))

lg<-legend(6.5, 4.2, c("setosa", "versicolor", "virginica"),
      cex=1, pch=1:3, title=expression("kg/km"^2), bty="n")

x1 <- lg$rect$left
y1 <- lg$rect$top - lg$rect$h
x2 <- x1 + lg$rect$w
y2 <- lg$rect$top + .1  # change the .1 to get more or less space

rect(x1,y1,x2,y2)


On 26/10/06, Denis Chabot <chabotd at globetrotter.net> wrote:
> Hi,
>
> I've looked at the parameters available for the legend function and
> cannot find a way to change the distance between the top of the box
> surrounding a legend and the legend's title. I have a math expression
> that raises the height of my title.
>
> If you don't mind the non-sensical title I give to the legend for
> this plot (Figure 3.20 in R Graphics):
>
> with(iris,
>        plot(Sepal.Length, Sepal.Width,
>             pch=as.numeric(Species), cex=1.2))
> legend(6.5, 4.2, c("setosa", "versicolor", "virginica"),
>        cex=1, pch=1:3, title=expression("kg/km"^2))
>
> The result depends on the device, but I think any device will show
> the box needs to be raised a bit (in quartz, the top of the box
> passes in the middle of the "2", in pdf it is acceptable, but just
> (the top of the box lightly touches the top of the "2").
>
> Sincerely,
>
> Denis Chabot
>
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-- 
=================================
David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP