下面程序是用R语言分析展示购买量前十的商品种类和购买总量 请解释每一句的含义,并记忆 1.library(RMySQL) 2.conn<-dbConnect(MySQL(),dbname='dblab',username='root',password='root123',host="127.0.0.1",port=3306) 3.user_action <- dbGetQuery(conn,'select * from user_action') 4.library(ggplot2) 5.temp <- subset(user_action,as.numeric(behavior_type)==4) 6.nrow(temp) 7.count <- sort(table(temp$item_category),decreasing = T) 8.print(count[1:10]) 9.result <- as.data.frame(count[1:10]) 10.ggplot(result,aes(Var1,Freq,col=factor(Var1)))+geom_point()