I think you got some hints in your question on the other question. Look at that again and then look at these: http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers
Since it appears to be yet another homework problem and you haven't shown any work whatsoever I'll just say that you can create this array with a for loop, though it's not clear what the pattern is for the second P. Does it do pairs of numbers, like 0 0 1 1 2 2 3 3 4 4?
