R语言把大量记录型数据转换成矩阵

Question

如题所述

Answer 1

dat1=data.frame(host=c("A","A","A","E","E","G"),
guest=c("C","B","D","Q","F","W"),
num=c(2,1,2,3,0,2))

library(reshape)
dat2=cast(dat1,host~guest,value="num")
dat2本回答被网友采纳