问题
I am having trouble formatting my legend. I would like to increase the vertical space between each element of the legend.
I post the image it produces and the code so you can help me if you want.
This is the code relative to the legend:
par(fig = c(0, 1, 0, 1), oma = c(0, 0, 0, 0), mar = c(0, 0, 0, 0), new = TRUE)
legend("right", c("$\\lambda < \\lambda_{cr}$ ", "$\\lambda < \\lambda_{cr}$",
"$\\lambda = \\lambda_{cr}$ ", "$\\lambda = \\lambda_{cr}$ "), xpd = TRUE,
inset = c(0,0), bty = "n", lty = c(1, 1, 1, 1), lwd=2, col = c("black","green4","red","blue"))
回答1:
When you consult the legend manual, for example by typing ?legend into your R console, you find
Arguments
...
x.intersp - character interspacing factor for horizontal (x) spacing.
y.intersp - the same for vertical (y) line distances.
To fix your legend, you could start with an interspacing factor of 2, so your legend call would become
legend("right", c(
"$\\lambda < \\lambda_{cr}$ ",
"$\\lambda < \\lambda_{cr}$",
"$\\lambda = \\lambda_{cr}$ ",
"$\\lambda = \\lambda_{cr}$ "
), xpd = TRUE, inset = c(0,0), bty = "n", lty = c(1, 1, 1, 1),
lwd=2, col = c("black","green4","red","blue"),
y.intersp=2)
If that gives you too much or too little space between the items, adjust the value accordingly.
来源：https://stackoverflow.com/questions/38332355/vertical-spaces-in-legend