[R] Question regarding legend look

David Winsemius dwinsemius at comcast.net
Wed Dec 1 17:51:02 CET 2010

On Dec 1, 2010, at 10:13 AM, Filoche wrote:

> Hi everyone.
> I have a quick question regarding the look of my legend in my plot.  
> As you
> can see in the next figure, I have 3 series.
> http://r.789695.n4.nabble.com/file/n3067466/legend.png
> However, I find rather difficult to differentiate the series 1 and 3
> according to their line type (lty). I would like to know if it was  
> possible
> to make the line type in the legend to appear more clearly. For  
> example, to
> give more horizontal space each side of the symbols "square" to have a
> better idea of the line type.

The specifics will depend on what plotting function produced the graph  
from which you have given us a bitmap snapshot BUT NOT SHOWN US CODE  
OR SAMPLE DATA. In xyplot you would be working with the key/lines/size  
elements (after showing us which of the several legend options were  


In base graphics I do not see a "handle" on the line length but  
(perhaps) you could emphasize the line compenent by increasing cex  
which affects all components and at the same time decrease the point  
size. E.g.:

  legend( ..., cex=1.5, pt.cex=0.8, cex=1.5, pt.cex=0.8, ...)

As always____>
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
__ ___________________________________

David Winsemius, MD
West Hartford, CT

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