i want to generate random matrix "P" but every alternate entry in each of the column is repeating

for i = 1:22

for j=1:22

if mod(j,2)==0

P(j,i) = y_random(i); %y coordinate

else

P(j,i) = x_random(i); %x coordinate

end

end

end

[Torsten]

Sure it's repeating - you programmed it this way.

If you want a random matrix, use

P = rand(22)          

P = 22×22

0.9346 0.9789 0.9578 0.7166 0.0472 0.1760 0.8989 0.9156 0.3481 0.1957 0.9220 0.7317 0.0076 0.8249 0.3949 0.6640 0.4487 0.1852 0.0834 0.6681 0.1810 0.8780 0.1148 0.1841 0.0556 0.7451 0.0396 0.9463 0.5383 0.3655 0.2066 0.4491 0.5641 0.4371 0.2924 0.2687 0.3237 0.1032 0.9946 0.8092 0.6759 0.3324 0.0333 0.9699 0.7134 0.8919 0.7457 0.1873 0.8257 0.3983 0.5040 0.3159 0.2772 0.6381 0.2632 0.3511 0.5542 0.0778 0.6283 0.7358 0.4224 0.6234 0.8885 0.9053 0.7685 0.9662 0.2146 0.3595 0.8814 0.8775 0.0367 0.9523 0.8857 0.1493 0.0755 0.4780 0.6303 0.6589 0.7972 0.6591 0.3146 0.6295 0.1493 0.9122 0.4348 0.1752 0.1694 0.2698 0.0410 0.7687 0.3145 0.7272 0.6395 0.6486 0.8137 0.3197 0.9943 0.6357 0.0739 0.2440 0.2113 0.7376 0.7676 0.3079 0.6216 0.4057 0.2785 0.5171 0.5347 0.9478 0.7669 0.8096 0.0782 0.1588 0.0143 0.6447 0.1031 0.7187 0.5581 0.9310 0.3553 0.2727 0.4876 0.6898 0.7905 0.0252 0.7658 0.0446 0.1784 0.1796 0.8428 0.7044 0.0429 0.8454 0.1957 0.6282 0.8123 0.2247 0.8438 0.3475 0.3701 0.0270 0.0477 0.3939 0.9633 0.5509 0.8913 0.7885 0.2482 0.5045 0.2911 0.6527 0.0318 0.6300 0.9062 0.4976 0.8651 0.2643 0.5700 0.8530 0.5715 0.5634 0.2833 0.7937 0.4980 0.7644 0.2160 0.3745 0.6791 0.7737 0.0038 0.7299 0.7244 0.5446 0.5651 0.9804 0.0434 0.5233 0.4722 0.7103 0.2613 0.5475 0.0814 0.6187 0.0861 0.2433 0.2994 0.5401 0.8795 0.9552 0.8824 0.9315 0.1594 0.8332 0.4965 0.4580 0.6456 0.9044 0.3306 0.1824 0.0086 0.1815 0.7589 0.1486 0.2056 0.1205 0.1695 0.5939 0.4038 0.1118 0.4629 0.3232 0.7241 0.4295 0.4222 0.4542 0.0821 0.0234 0.1418 0.1401

[Bushra Atta Khakwani khakwani]

I want to generate a random matrix from the defind range of xrandom and y random

[Torsten]

And why do you define two vectors ? How should x_random and y_random be used to define P(i,j) ?

Maybe something like this ?

x_random = rand(22,1);
y_random = rand(22,1);
P = zeros(22);
for i = 1:22
    for j=1:22
        if mod(j,2)==0
            P(j,i) = y_random(randi(22)); %y coordinate
        else
            P(j,i) = x_random(randi(22)); %x coordinate
        end
    end 
end
P

P = 22×22

0.4638 0.0297 0.9974 0.3303 0.5157 0.3903 0.9375 0.4202 0.3303 0.6418 0.7993 0.6285 0.7993 0.3889 0.0167 0.9974 0.6862 0.3860 0.7993 0.0913 0.3903 0.1146 0.9660 0.0085 0.9169 0.8784 0.8784 0.2872 0.6207 0.9660 0.2997 0.5111 0.2997 0.2997 0.1494 0.2997 0.9169 0.9469 0.2997 0.5111 0.3422 0.2872 0.6130 0.2872 0.6862 0.1146 0.7993 0.0913 0.0913 0.3889 0.0913 0.6862 0.5157 0.5157 0.3303 0.1516 0.3303 0.0913 0.9375 0.6862 0.0167 0.0167 0.6285 0.9542 0.1516 0.6862 0.2872 0.9469 0.4641 0.2997 0.5111 0.9469 0.2040 0.6130 0.9469 0.2997 0.8784 0.8784 0.9846 0.3422 0.9169 0.1494 0.1494 0.8354 0.7551 0.4641 0.9846 0.2040 0.3303 0.3903 0.4202 0.1146 0.4638 0.6862 0.0913 0.5157 0.4638 0.4202 0.1516 0.3860 0.3854 0.3903 0.3303 0.3303 0.0913 0.1516 0.0913 0.3854 0.4638 0.3860 0.8252 0.9883 0.9660 0.7551 0.6851 0.3422 0.2078 0.9883 0.2872 0.2040 0.9469 0.6130 0.2040 0.9660 0.8784 0.2872 0.8252 0.3422 0.0085 0.4641 0.6851 0.9883 0.6418 0.3303 0.6862 0.9974 0.3303 0.4202 0.4638 0.5157 0.5157 0.6862 0.4638 0.0167 0.8718 0.4638 0.9974 0.3860 0.7993 0.6862 0.9542 0.9974 0.4638 0.7805 0.6207 0.8050 0.8050 0.8050 0.9469 0.6130 0.8784 0.3422 0.2040 0.8784 0.9846 0.9469 0.6130 0.6851 0.2040 0.8354 0.8050 0.2078 0.8354 0.9846 0.8354 0.3422 0.9542 0.4202 0.7805 0.0297 0.3903 0.0167 0.9375 0.9375 0.1516 0.7993 0.1146 0.3303 0.3860 0.6285 0.9542 0.9974 0.3303 0.3903 0.7993 0.7993 0.7805 0.6285 0.0085 0.9883 0.2997 0.8354 0.3422 0.6207 0.7551 0.9846 0.4641 0.9169 0.1494 0.6130 0.9846 0.6207 0.6207 0.2997 0.9883 0.0085 0.9169 0.9883 0.8784 0.6130

or

x_random = rand(22,1);
y_random = rand(22,1);
P = zeros(22);
for j = 1:22
  if mod(j,2)==0
    P(j,:) = y_random(randperm(22));
  else
    P(j,:) = x_random(randperm(22));
  end
end
P

P = 22×22

0.7590 0.2697 0.2642 0.6825 0.6345 0.4673 0.6329 0.9049 0.1416 0.5564 0.7226 0.1874 0.4541 0.2895 0.2086 0.5237 0.8834 0.8906 0.3734 0.9382 0.8326 0.4598 0.8514 0.9793 0.5214 0.7886 0.6236 0.6631 0.5441 0.5257 0.5851 0.1617 0.8995 0.0537 0.4587 0.2627 0.1772 0.4890 0.6674 0.8498 0.4195 0.3676 0.5692 0.9723 0.4598 0.5237 0.1874 0.6825 0.6345 0.2642 0.6329 0.4673 0.2086 0.9382 0.7590 0.8834 0.9049 0.1416 0.4541 0.8326 0.5564 0.8906 0.3734 0.2895 0.2697 0.7226 0.8995 0.4195 0.0537 0.7886 0.9793 0.9723 0.5692 0.1772 0.8498 0.6674 0.5257 0.2627 0.6236 0.1617 0.5851 0.5441 0.3676 0.8514 0.4890 0.4587 0.6631 0.5214 0.2697 0.1416 0.6329 0.2642 0.3734 0.4598 0.1874 0.8834 0.4673 0.6345 0.7226 0.6825 0.5564 0.4541 0.7590 0.9049 0.5237 0.2895 0.8326 0.8906 0.9382 0.2086 0.6236 0.7886 0.5214 0.1772 0.6631 0.8514 0.8498 0.9723 0.4195 0.4587 0.9793 0.5257 0.5692 0.1617 0.6674 0.8995 0.4890 0.2627 0.5441 0.0537 0.5851 0.3676 0.2895 0.1416 0.6329 0.9049 0.8906 0.5564 0.9382 0.7226 0.4541 0.8834 0.7590 0.2697 0.1874 0.2086 0.8326 0.2642 0.3734 0.4598 0.6345 0.6825 0.4673 0.5237 0.8514 0.4195 0.9723 0.7886 0.6236 0.1772 0.5441 0.8498 0.5214 0.3676 0.5851 0.4890 0.4587 0.2627 0.5257 0.6631 0.8995 0.5692 0.1617 0.6674 0.0537 0.9793 0.1874 0.2642 0.2086 0.4541 0.3734 0.9382 0.8834 0.6825 0.6329 0.5564 0.5237 0.2895 0.1416 0.4598 0.9049 0.4673 0.7226 0.7590 0.6345 0.8326 0.8906 0.2697 0.9723 0.6674 0.5441 0.5692 0.2627 0.1772 0.8514 0.0537 0.3676 0.9793 0.6631 0.5214 0.5851 0.7886 0.4587 0.6236 0.5257 0.4195 0.4890 0.1617 0.8995 0.8498