(df1)3.2 行数 nrow(df1)3.3 列数 ncol(df1)3.4 行名 rownames(df1)3.5 列名 colnames(df1)4.data.frame取子集 -"$"符 df1...$gene4.1 按坐标df1[2,2] #[ ]内前面的数字为行,后面的数字为列df1[2,] #提出第二行(包含行名)df1[,2] #提出第二列df1[c(1,3),1:2] #提出第1和3行,第...[df1$score>0,] #提取score>0的行4.3 筛选score > 0的基因df1[df1$score > 0,1] #提取第1列中score>0的基因名df1$gene[df1$score...B","O","AB"))test1test2 <- data.frame(name = c('Damon','jimmy','nicker','tony'), group...= c("group1","group1","group2","group2"), vision = c(4.2,4.3,4.9,4.5))test2test3