why this prog is not working properly??

L=10;

a=1/(2^(1/2));

arr=[0 0 0 0 0 0 0 0 0 1 0;0 1 0 0 1 0 0 1 0 0 1;1 0 0 0 0 0 1 0 0 -1 0;1 1 0 0 1 0 1 1 0 0 -1;0 0 0 1 0 0 0 1 0 0 1;0 1 0 1 1 0 0 0 0 1 0;1 0 0 1 0 0 1 1 0 0 -1;1 1 0 1 1 0 1 0 0 -1 0;0 0 1 0 0 1 0 0 1 a a;0 1 1 0 1 1 0 1 1 -a a;1 0 1 0 0 1 1 0 1 -a -a;1 1 1 0 1 1 1 1 1 a -a;0 0 1 1 0 1 0 1 1 -a a;0 1 1 1 1 1 0 0 1 a a;1 0 1 1 0 1 1 1 1 a -a;1 1 1 1 1 1 1 0 1 -a -a];

nstate1=0;

nstate2=0;

for h=1:L

      input=randi(2,1,2)-1;

      pstate1=nstate1;

      pstate2=nstate2;

      for i=1:16

          if (arr(i,1)==input(1,1)) && (arr(i,2)==input(1,2)) && (arr(i,3)==pstate1) && (arr(i,4)==pstate2)

              ii = i;

          end

      end

      nstate1=arr(ii,5);

      nstate2=arr(ii,6);

      sireal(h)=arr(ii,10);

      siimag(h)=arr(ii,11);

      si(h)=complex(sireal(h),siimag(h));

end

the values of si should be an array of 10 complex values .. but when i run it i didn't get those values!!

[Jan]

And do we have a chance to guess, which results are the ones you want?

[mary]

the results should be complex numbers comes from my array "arr" from the last 2 col 11 & 10 depending on the input and present state. whenever my input and present state maches one of the rows i will take col 11 and col 10 of the same row as the complex number values . this will happen for each loop for i=1:16

[Cedric]

If you get no answer, I would say that it would be a good occasion for learning how to execute your code step by step.

Place your cursor on the row " nstate1=0; " anywhere, press F12 for creating a break point (indicated by a large red dot), then press F5. You see that a green cursor appeared where your break point was set, indicating that your code was run until this point. If you have MATLAB R2012, a tab with debugging options for stepping in/out/to cursor also appeared. On former versions, you find them in a menu called Debug. The command line prompt is now K>>, which indicates that you are in the debugger. You could stop it by pressing shift+F5, but don't do it now. Passing your cursor above variables that were defined above the break point shows their content; you can also type their name on the command line to display them. Now you can move forward in the execution of your code by pressing F10 or F11. F10 executes functions without stepping in, and F11 steps in (you'll have to try both to see the difference once you have a code that calls functions). If you wanted to move after the for loop, you could set a second break point right after the end of the loop and press F5 (which executes the code until the next break point). As mentioned, there are several additional features, like run to cursor, etc. You'll have to play a little with these things to get familiar.

Knowing that, you can easily execute your code step by step and see if what is done is what you expected.

[Jan]

@Cedric: This is a valid and good answer already. +1 for your comment.