Traverse Matrix in Diagonal strips

Question

I thought this problem had a trivial solution, couple of for loops and some fancy counters, but apparently it is rather more complicated.

So my question is, how woul

Answer 1

Pseudo code:

N = 2 // or whatever the size of the [square] matrix
for x = 0 to N
  strip = []
  y = 0
  repeat
     strip.add(Matrix(x,y))
     x -= 1
     y -= 1
  until x < 0
  // here to print the strip or do some' with it

// And yes, Oops, I had missed it... 
// the 2nd half of the matrix...
for y = 1 to N    // Yes, start at 1 not 0, since main diagonal is done.
   strip = []
   x = N
   repeat
      strip.add(Matrix(x,y))
      x -= 1
      y += 1
   until x < 0
  // here to print the strip or do some' with it

(Assumes x indexes rows, y indexes columns, reverse these two if matrix is indexed the other way around)