Replace values in df/matrix based on another matrix/df in R

Question

I have two data frames, one contains numbers, and the second is binary, both are the same size. I would now like to replace all numbers in data frame A with NA if the corresponding variable in data frame B is 0 and not 1. If it is 1 the number should remain unchanged. How do I go about that?

df A

   A  B  C
1  34 32 12
2  52 23 34

df B

   A  B  C
1  1  1  1
2  0  0  1

desired result

   A  B  C
1  34 32 12
2  na na 34

Answer 1

如果你正在使用矩阵，它就像mat1[which(mat2 == 0)] <- NA一样简单。

Answer 2

我找到了答案，在阅读了文档之后，我认为替换命令仅适用于向量，但以下是诀窍：

new.df <- replace(A.df, B.df == 0, "NaN")