1、测试
> par(mfrow=c(2,2)) > plot(1:10, main = "001") > plot(1:10, main = "002", xaxt = "n") ## 去除x轴 > plot(1:10, main = "003", yaxt = "n") ## 去除y轴 > plot(1:10, main = "004", axes = F) ## 同时去除x轴和y轴