R語言中求數據框每一列的最大值、最小值、平均數、中位數、方差和標准差
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d <- data.frame(v1=sample(1:10,6),v2=sample(1:10,6),v3=sample(1:10,6), v4=sample(1:10,6)) rmax <- vector() rmin <- vector() rmean <- vector() rmed <- vector() rvar <- vector() rsd <- vector() for (i in 1:ncol(d)) { rmax = c(rmax,max(d[,i])) rmin = c(rmin,min(d[,i])) rmean = c(rmean,mean(d[,i])) rmed = c(rmed,median(d[,i])) rvar = c(rvar,var(d[,i])) rsd = c(rsd,sd(d[,i])) } d <- rbind(d,rmax,rmin,rmean,rmed,rvar,rsd)
d
