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遇到“+”时式子没写完，如果无法继续完成，可在console中输入
;以结束，Ctrl+L清屏无法结束。 -
barplot(height = , names = , col = ) -
$无法对矩阵进行提取，只能用于数据框。
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base R plot:
lty : line type;
pch : marker shape;
lwd : line width;
type : line between dots type;
cex : shape size;
col : control colors.
margin
mar()for margin,oma()for outer margin erea.
eg.par(oma=c(3,3,3,3)) par(mar=c(5,4,4,2) + 0.1) plot(0:10, 0:10, xlab= "X", ylab= "Y", type= "n") # type="n"hide the points text(5, 5, "plot", cex=2, col="red") box(col="red") ... box("figure", col="forestgreen") ... box("outer", col="blue")`las`allows to change the orientation of axis labels. (0, 1, 2, 3)
