...data.frame(name=c("小亮","小欣","小明","小红"),english=c(95,77,59,42))
用merge()函数将两个数据框合并,最终生成结果顺序发生了变化,且无论math和english顺序是否变化,得到的是一样的结果
c <- merge(math,english)c name math english
1 小亮 64 ...
...rix=assay(expdat)Error in (function (classes, fdef, mtable) : unable to find an inherited method for function ‘assay’ for signature ‘"spec_tbl_df", "missing"’