This is how I do it (hope it's not your homework I just did):
A = [...
64 2 3 61 60 6 7 57
9 55 54 12 13 51 50 16
17 47 46 20 21 43 42 24
40 26 27 37 36 30 31 33
32 34 35 29 28 38 39 25
41 23 22 44 45 19 18 48
49 15 14 52 53 11 10 56
8 58 59 5 4 62 63 1]
meanOfRows1to4 = mean(A(1:4,:), 1)
rows = size(A, 1);
output = A + repmat(meanOfRows1to4, [rows, 1])
output =
96.5 34.5 35.5 93.5 92.5 38.5 39.5 89.5
41.5 87.5 86.5 44.5 45.5 83.5 82.5 48.5
49.5 79.5 78.5 52.5 53.5 75.5 74.5 56.5
72.5 58.5 59.5 69.5 68.5 62.5 63.5 65.5
64.5 66.5 67.5 61.5 60.5 70.5 71.5 57.5
73.5 55.5 54.5 76.5 77.5 51.5 50.5 80.5
81.5 47.5 46.5 84.5 85.5 43.5 42.5 88.5
40.5 90.5 91.5 37.5 36.5 94.5 95.5 33.5
Best Answer