boxplot-produce a box plot of the data
biplot-creats a biplot of the coefficients in the matrix coefs
-allows you to visualize the magnitude and sign of each variable‘s contribution to the first two or three principle components
pareto-pareto chart
-this function labels each bar with its element index in Y and also plots a line displaying the cumulaive sum of Y
原文：http://www.cnblogs.com/luhan-fighting/p/4447487.html