R语言中基础绘图par(oma）选项的作用

001、par(oma）选项的作用是调整外框线距离绘图边界的距离。

par(oma = c(1, 1, 1, 1)) 
plot(1:10, main = "oma = 1", cex.main = 3)
box(which = "figure", lwd = 5)
box(which = "plot", lwd = 5)

par(oma = c(5, 5, 5, 5)) 
plot(1:10, main = "oma = 5", cex.main = 3)
box(which = "figure", lwd = 5)
box(which = "plot", lwd = 5)