Legend titles work in linear plots:
curve(1/x, xlim = c(0, 1))
legend(x = 'topright', inset = 0.04,
legend = '1/x', lty = 1,
title = 'Legend Title')
But when you change to a log plot on either dimension things get screwy:
curve(1/x, xlim = c(0, 1), log = 'y')
legend(x = 'topright', inset = 0.04,
legend = '1/x', lty = 1,
title = 'Legend Title')
If you save the value legend() returns you can look at it and see that
it's messed up:
l <- legend(x = 'topright', inset = 0.04,
legend = '1/x', lty = 1,
title = 'Legend Title')
> l
$rect
$rect$w
[1] 0.2349272
$rect$h
[1] 0.2727899
$rect$left
[1] 0.7618728
$rect$top
[1] 1.9936
$text
$text$x
[1] 0.9188374
$text$y
[1] 1.81174
> R.Version()
$platform
[1] "i686-redhat-linux-gnu"
$arch
[1] "i686"
$os
[1] "linux-gnu"
$system
[1] "i686, linux-gnu"
$status
[1] ""
$major
[1] "2"
$minor
[1] "2.1"
$year
[1] "2005"
$month
[1] "12"
$day
[1] "20"
$"svn rev"
[1] "36812"
$language
[1] "R"
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