如何处理＆QUOT;非顺应性＆QUOT;数组？ [英] How to deal with "non-conformable" arrays?

问题描述

一个人如何做逐元素算术运算的两个数组，其
贴合在第一维度，但一个人也一个额外的维度？

How does one do element-wise arithmetic operations with two arrays that are conformable in the first dimensions but one has also an extra dimension?

为例，乘以阵列 A （3×3×2）阵列 B （3×3）：

Example, multiply array a (3 x 3 x 2) by array b (3 x 3):

a <- array(1:18, dim=c(3,3,2))
b <- diag(3)

下失败，因为数组非顺应性。

The following fails because the arrays are non-conformable.

> a * b

有关它的工作，你必须投阵列 B 到一个数组与正确的
维数。

For it to work, you have to cast array b into an array with the correct number of dimensions.

> a * array(b, dim=c(3,3,2))

这并不在我看来他们是非常简单，我敢肯定有一定
是一个简单的方法。

This doesn't strike me as being very straightforward and I'm sure there must be a simpler way.

推荐答案

您可以试试：

a * c(b)

C 将去除属性，那么这将使回收b 作为一个简单的载体，导致我相信是你想要的结果：

c will strip attributes, which will then allow recycling of b as a simple vector and lead to what I believe is your desired outcome:

, , 1

     [,1] [,2] [,3]
[1,]    1    0    0
[2,]    0    5    0
[3,]    0    0    9

, , 2

     [,1] [,2] [,3]
[1,]   10    0    0
[2,]    0   14    0
[3,]    0    0   18

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