[R] legend, "lheight", and alignment

[Peter Ehlers]

On 2011-12-01 08:54, emorway wrote:
> Hello,
>
> A bit of fairly simple code, yet I don't seem to be able to manipulate it
> quite as much as I would like:
>
> 1)  It would be nice if the objects appearing in the legend were aligned,
> and by aligned I mean the boxes are centered over the lines.  Do I need to
> adjust the use of "NA" in the code below to accomplish this?  Here's how it
> appears on my machine:
>
> http://r.789695.n4.nabble.com/file/n4129402/example.png
>
> 2)  Because I'm using a call to 'expression' in the text contained in the
> legend, it would be nice to space  the lines of text a bit more.  My feeble
> attempt was to increase the lheight parameter in the hopes this would affect
> the legend...to no avail.  Further, lheight cannot be added to the argument
> list of legend.  I've been unable to track down another parameter applicable
> to legend, suggestions very much appreciated.
>
> par(lheight=2)
> plot(1,1,col="white")
>
> legend("center", legend=c(expression(paste("Observed
> ",italic(bar(EC)[e]))),expression(paste("Simulated
> ",italic(bar(EC)[e]))),"test1","test2"),
>         lty = c(NA,NA,1,1),
>         col = c("black","black","red","blue"),
>         density = c(NA,25,NA,NA),
>         border=c("black","black",NA,NA),
>         fill = c("grey","black",NA,NA),
>         angle = c(NA,45,NA,NA),
>         cex = 1.25, bty = "n", xpd = TRUE)
>

You can adjust the alignment a little by adding 'merge = TRUE';
this will left-align both the boxes and the lines.

For your second question, use the y.intersp argument, e.g.
'y.intersp = 2'.

You might also avoid using 'paste' in your expressions;
Try replacing
   expression(paste("Observed",italic(bar(EC)[e])))

with
   expression("Observed"~italic(bar(EC)[e]))


Peter Ehlers

>
>> sessionInfo()
> R version 2.13.2 (2011-09-30)
> Platform: x86_64-pc-mingw32/x64 (64-bit)
>
> locale:
> [1] LC_COLLATE=English_United States.1252
> [2] LC_CTYPE=English_United States.1252
> [3] LC_MONETARY=English_United States.1252
> [4] LC_NUMERIC=C
> [5] LC_TIME=English_United States.1252
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> loaded via a namespace (and not attached):
> [1] tools_2.13.2
>>
>
>
> --
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>
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