R - 基于列名的子集 [英] R - Subset based on column name

问题描述

我的数据框有超过 120 列(变量)，我想根据列名创建子集.

My data frame has over 120 columns (variables) and I would like to create subsets bases on column names.

例如，我想创建一个子集，其中列名包含字符串mood".这可能吗?

For example I would like to create a subset where the column name includes the string "mood". Is this possible?

推荐答案

我一般用

    SubData <- myData[,grep("whatIWant", colnames(myData))]

我很清楚,"不是必需的，而且列名可以替换为名字但它不适用于矩阵，而且我讨厌在更改对象时更改形式.

I know very well that the "," is not necessary and colnames could be replaced by names but it would not work with matrices and I hate to change the formalism when changing objects.

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