1、
> par(mfrow = c(2,3)) > plot(1:10, bty = "o", main = "ooo", cex.main = 3) > plot(1:10, bty = "l", main = "lll", cex.main = 3) > plot(1:10, bty = "u", main = "uuu", cex.main = 3) > plot(1:10, bty = "c", main = "ccc", cex.main = 3) > plot(1:10, bty = "]", main = "]]]", cex.main = 3) > plot(1:10, bty = "n", main = "nnn", cex.main = 3)