如何从R中的矩阵中删除列名? [英] How to remove column names from a matrix in R?

问题描述

  M = matrix(1:9,3,3)
colnames(M)=c('a','b','c')

假设我有一个矩阵M，其列名为'a'，'b'，'c'.我想删除名称，以便M

Suppose I have a matrix M , with column names 'a','b','c'. And I want to remove the names, so that M

M    [,1] [,2] [,3]
[1,]    1    4    7
[2,]    2    5    8
[3,]    3    6    9

而不是

       a     b    c
[1,]    1    4    7
[2,]    2    5    8
[3,]    3    6    9

我该怎么做?

推荐答案

您可以尝试

colnames(M) <- NULL

使用您的示例:

> M
#     a b c
#[1,] 1 4 7
#[2,] 2 5 8
#[3,] 3 6 9
> colnames(M) <- NULL
> M
#     [,1] [,2] [,3]
#[1,]    1    4    7
#[2,]    2    5    8
#[3,]    3    6    9

但是，如果您的数据存储在data.frame中而不是矩阵中，则将无法使用.如?data.frame中所述:

However, if your data is stored in a data.frame instead of a matrix, this won't work. As explained in ?data.frame:

列名应为非空，并且尝试使用空名称将导致不支持的结果

The column names should be non-empty, and attempts to use empty names will have unsupported results

如果您的数据存储为data.frame(可以使用class(my_data)进行检查)，则可以尝试使用M <- as.matrix(my_data)将其转换为矩阵.希望这会有所帮助.

If your data is stored as a data.frame (this can be checked with class(my_data)), you could try to convert it into a matrix with M <- as.matrix(my_data). Hope this helps.

这篇关于如何从R中的矩阵中删除列名?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！