R语言中reshape2包 dcast函数数据的重铸
1、测试数据
ID <- c(1, 1, 2, 2)
Time <- c(1, 2, 1, 2)
X1 <- c(5, 3, 6, 2)
X2 <- c(6, 5, 1, 4)
mydata <- data.frame(ID, Time, X1, X2)
mydata
2、数据的融合
每个测量变量独占一行,行中带有要唯一确定这个测量所需的标识符变量
mydata
md <- melt(mydata, id = c("ID","Time"))
md
3、数据的重铸(整合数据为特定的形式)
测试1
md
a <- dcast(md, ID~variable, mean)
a
测试2
md
b <- dcast(md,Time~variable, mean)
b
测试3
md
c <- dcast(md,ID+Time~variable)
c
测试4
md
d <- dcast(md,ID+variable~Time)
d
测试5
md
e <- dcast(md, ID~variable+Time)
e