ruby: sum corresponding members of two or more arrays

Question

I\'ve got two (or more) arrays with 12 integers in each (corresponding to values for each month). All I want is to add them together so that I\'ve got a single array with su

Answer 1

@FriendFX, you are correct about @user2061694 answer. It only worked in Rails environment for me. You can make it run in plain Ruby if you make the following changes...

In the IRB

[[0, 0, 0], [2, 2, 1], [1,3,4]].transpose.map {|a| a.inject(:+)}
 => [3, 5, 5]


[[1,2,3],[4,5,6]].transpose.map {|a| a.inject(:+)}
 => [5, 7, 9]