conditional replacement of elements of matrix with another matrix column

deaR useRs,

I have the matrix "A" and matrix "B" and I want the matrix "C". Is there a way of doing it?

dput(A)

structure(c(12, 12, 12, 13, 13, 13, 14, 14, 14, NA, NA, NA, NA,
NA, NA, NA, NA, NA), .Dim = c(9L, 2L))

dput(B)

structure(c(11, 11, 11, 13, 13, 13, 14, 14, 14, 6, 7, 8, 9, 10,
11, 12, 13, 14), .Dim = c(9L, 2L))

dput(C)

structure(c(12, 12, 12, 13, 13, 13, 14, 14, 14, NA, NA, NA, 9,
10, 11, 12, 13, 14), .Dim = c(9L, 2L))

Precisely, I want to replace the elements of 2nd column of A with those of B provided the elements of 1st column match. Is there a single line loop or code for that?


Thanks in advance,

Eliza Botto