>> clear all
A=rand(16)
f=1; c=1;
for i=1:size(A,1)/4 %fila
for j=1:size(A,1)/4 %columna
C(i,j)=sum(sum(A(f:f+3,c:c+3)));
c=c+4;
end
c=1;
f=f+4;
end
C
A =
Columns 1 through 6
0.9394 0.4106 0.5518 0.7829 0.1771 0.3390
0.0182 0.9843 0.5836 0.6938 0.8296 0.2101
0.6838 0.9456 0.5118 0.0098 0.7669 0.5102
0.7837 0.6766 0.0826 0.8432 0.9345 0.9064
0.5341 0.9883 0.7196 0.9223 0.1079 0.6289
0.8854 0.7668 0.9962 0.7710 0.1822 0.1015
0.8990 0.3367 0.3545 0.0427 0.0991 0.3909
0.6259 0.6624 0.9713 0.3782 0.4898 0.0546
0.1379 0.2442 0.3464 0.7043 0.1932 0.5013
0.2178 0.2955 0.8865 0.7295 0.8959 0.4317
0.1821 0.6802 0.4547 0.2243 0.0991 0.9976
0.0418 0.5278 0.4134 0.2691 0.0442 0.8116
0.1069 0.4116 0.2177 0.6730 0.5573 0.4857
0.6164 0.6026 0.1257 0.4775 0.7725 0.8944
0.9397 0.7505 0.3089 0.6237 0.3119 0.1375
0.3545 0.5835 0.7261 0.2364 0.1790 0.3900
Columns 7 through 12
0.9274 0.5493 0.2815 0.1386 0.3610 0.8842
0.9175 0.3304 0.2304 0.5882 0.6203 0.0943
0.7136 0.6195 0.7111 0.3662 0.8112 0.9300
0.6183 0.3606 0.6246 0.8068 0.0193 0.3990
0.3433 0.7565 0.5906 0.5038 0.0839 0.0474
0.9360 0.4139 0.6604 0.4896 0.9748 0.3424
0.1248 0.4923 0.0476 0.8770 0.6513 0.7360
0.7306 0.6947 0.3488 0.3531 0.2312 0.7947
0.6465 0.9727 0.4513 0.4494 0.4035 0.5449
0.8332 0.3278 0.2409 0.9635 0.1220 0.6862
0.3983 0.8378 0.7150 0.0423 0.2684 0.8936
0.7498 0.7391 0.8562 0.9730 0.2578 0.0548
0.8352 0.9542 0.2815 0.1892 0.3317 0.3037
0.3225 0.0319 0.7311 0.6671 0.1522 0.0462
0.5523 0.3569 0.1378 0.5864 0.3480 0.1955
0.9791 0.6627 0.8367 0.6751 0.1217 0.7202
Columns 13 through 16
0.7218 0.5039 0.8008 0.3725
0.8778 0.6468 0.8961 0.5932
0.5824 0.3077 0.5975 0.8726
0.0707 0.1387 0.8840 0.9335
0.9227 0.4756 0.9437 0.6685
0.8004 0.3625 0.5492 0.2068
0.2859 0.7881 0.7284 0.6539
0.5437 0.7803 0.5768 0.0721
0.9848 0.6685 0.0259 0.4067
0.7157 0.1335 0.4465 0.6669
0.8390 0.0216 0.6463 0.9337
0.4333 0.5598 0.5212 0.8110
0.4706 0.3008 0.3723 0.4845
0.5607 0.9394 0.9371 0.7567
0.2691 0.9809 0.8295 0.4170
0.7490 0.2866 0.8491 0.9718
C =
9.5018 9.7104 7.8665 9.8001
10.8543 6.5471 7.7326 9.3583
6.3556 9.4797 7.9231 8.8143
7.7549 8.4231 6.3240 10.1754