R:在矩阵中将NA替换为另一个矩阵中NA的位置来替换元素 [英] R: Replace elements with NA in a matrix in corresponding positions to NA's in another matrix

问题描述

我有一个大矩阵z，我删除了所有> 3的值，并使用以下命令将其替换为NA:

I have a large matrix, z, that I removed all values >3 and replaced with NA using:

z[z>3]<-NA

我有另一个尺寸相同的矩阵y，我需要在与元素z中的元素替换位置相对应的位置中，用NA替换值. 也就是说，如果z[3,12]为> 3并替换为NA，我也需要将y[3,12]替换为NA.如果有帮助，它们具有相同的行名.

I have another matrix, y, of identical dimensions that I need to replace values with NA in positions corresponding to the locations where the elements were replaced in element z. That is, if z[3,12] was >3 and replaced with NA, I need y[3,12] to be replaced with NA too. They have the same row names if that helps.

推荐答案

如何:

is.na(y) <- is.na(z) <- z < 3 & !is.na(z)

或简单地

is.na(y) <- is.na(z) <- z < 3

如果保证z在分配之前没有丢失的值

if z is guaranteed not to have missing values prior to the assignment

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