如何更改数组尺寸的顺序 [英] How to change order of array dimensions

问题描述

如何重新排列n维数组的维数.例如，如果我有一个三维销售数据数组，其中第一个维度表示日期，第二个维度表示商店，第三个维度表示部门.如何转换数组，以便第一个维度是Store，第二个维度是Department，第三个维度是Date.这只是一个例子.我希望有一个通用的解决方案.

How do I reorder the dimensions of an n dimensional array. For example, if I have a three dimensional array of sales data, where the first dimension represents the Date, the second dimension is the Store, and the third dimension is Department. How do I transform the array so that the first dimension is Store, the second is Department, and the third is Date. This is just an example. I am hoping for a general solution.

推荐答案

用于执行此操作的函数是aperm，来自基本包.它是转置t()函数对多维数组的概括.对于您的示例，您可以这样称呼它:

The function for doing that is aperm, from the base package. It is a generalization of the transpose t() function to multidimensional arrays. For your example, you would call it as follows:

new.data <- aperm(old.data, c(2,3,1))

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