行名& R中的列名 [英] Row names & column names in R

问题描述

以下函数对是否产生完全相同的结果?

Do the following function pairs generate exactly the same results?

对1)names()& colnames()

对2)rownames()& row.names()

推荐答案

正如奥斯卡·王尔德(Oscar Wilde)所说

As Oscar Wilde said

一致性是该产品的最后避难所 缺乏想象力.

Consistency is the last refuge of the unimaginative.

R更像是一种进化的语言，而不是设计的语言，因此发生了这些事情. names()和colnames()在data.frame上起作用，但names()在矩阵上不起作用:

R is more of an evolved rather than designed language, so these things happen. names() and colnames() work on a data.frame but names() does not work on a matrix:

R> DF <- data.frame(foo=1:3, bar=LETTERS[1:3])
R> names(DF)
[1] "foo" "bar"
R> colnames(DF)
[1] "foo" "bar"
R> M <- matrix(1:9, ncol=3, dimnames=list(1:3, c("alpha","beta","gamma")))
R> names(M)
NULL
R> colnames(M)
[1] "alpha" "beta"  "gamma"
R> 

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