» A = zeros(2,40)

A =

  Columns 1 through 16 

     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0

  Columns 17 through 32 

     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0

  Columns 33 through 40 

     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0

»