Given a table with two columns:

Perhaps there’s no facility to do this in the J language, but when I write:

How would you go about reshaping a length-N 1D array into an (N/2) x 2 array? In numpy, for example, you can use -1 in place of N/2 when reshaping:

What’s going on that makes this code work? It seems that using m in an anonymous verb (if that’s what it’s called) turns the verb into a postfix operator.