Idiomatic matrix type conversion, say convert Integer (0/1) matrix to boolean matrix

Question

I have:

 B <- matrix(c(1, 0, 0, 1, 1, 1), 
             nrow=3, 
             ncol=2)

and I want:

 B
      [,1] [,2]
[1,]           


        

Answer 1

A matrix is a vector with dim attributes. When we apply as.logical, the dim attributes are lost. It can be assigned with dim<-

`dim<-`(as.logical(B), dim(B))
#      [,1] [,2]
#[1,]  TRUE TRUE
#[2,] FALSE TRUE
#[3,] FALSE TRUE

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Or another option is create a logical condition that preserves the attribute structure

B != 0

Or

!!B