Hi All, I have 2 arrays: dim(a1) [1] 3 23 23 dim(a2) [1] 3 23 23 And I want a new array, to say, a3, where: dim(a3) [1] 6 23 23 where the first dimension is supposed to be (months) so the resultating array would start in jan and finish in june. Best regards, Antonio