rbind named vector to matrix with different lengths

Question

I am trying to bind together a named vector onto a matrix. The named vector has a different length as the matrix:

> m <- matrix(data = c("1", "2", "3"), 
            nrow = 1, ncol = 3, 
            dimnames = list(c(), 
                            c("column 1", "column 2", "column 3")))

> named_vec <- c("4", "5")
> names(named_vec) <- c("column 1", "column 2")

> rbind(m, named_vec)

I get the following:

Warning message:
In rbind(m, named_vec) :
  number of columns of result is not a multiple of vector length (arg 2)

This has the undesired effect of repeating the shorter vector.
Also, plyr's rbind.fill function does not work here, since both arguments need to be data frames:

> plyr::rbind.fill(data.frame(m), data.frame(named_vec))

Error: All inputs to rbind.fill must be data.frames

My desired output is a matrix that fills in missing values with NA's instead of repeating the vector, like this:

     column 1 column 2 column 3
[1,] "1"      "2"      "3"     
[2,] "4"      "5"      NA   

Answer 1

Below is a base R solution

do.call(rbind,lapply(u<-list(m,named_vec),`length<-`,max(lengths(u))))

such that

     column 1 column 2 column 3
[1,] "1"      "2"      "3"     
[2,] "4"      "5"      NA