相关系数矩阵 corrgram

install.packages("iterators")
install.packages("corrgram")
install.packages("kernlab")
library(iterators)
library(kernlab)
library(corrgram)
corrgram(mtcars, 
         order=TRUE,
         lower.panel=panel.shade,
         upper.panel=panel.pie,
         text.panel=panel.txt,
         main="Correlogram of mtcar intercorrelations")