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library(ggplot2)
library(glmnet)
library(reshape2)
# 读入数据
data <- read.csv('d:/ex2data2.txt',F)
# 散点图
ggplot()+ 
  geom_point(data=data,aes(V1,V2,colour=factor(V3),
                           shape=factor(V3)),size=3)