df1[,2] #取出来的列是向量df1[2] #不加逗号,可以取出列,并保留其数据框属性df1[c(1,3),1:2] #取第一行 第三行的前两个数(会继承行名、列名)#小tips:读懂error...load("gands.Rdata")seq(from=2,to=100,by=2)g[seq(2,100,2)]## 代码思维#如何取数据框的最后一列?...df1[,3]df1[,ncol(df1)]#如何取数据框除了最后一列以外的其他列?...df1$p.value <- c(0.01,0.02,0.07,0.05) df1#改行名和列名rownames(df1) <- c("r1","r2","r3","r4")#只修改某一行/列的名colnames...(df1)[2] <- "CHANGE"5.两个数据框的连接是excel做不到的功能——#先创建三个数据框test1 <- data.frame(name = c('jimmy','nicker','Damon