greater than less than

1. close all;
2. tag_arr = randi(0:1,1,8);
3. N = 16;
4. hadamardmat = hadamard(N);
5. codeTx1 = hadamardmat(:,1);
6. codeTx2 = hadamardmat(:,2);
7. codeTx3 = hadamardmat(:,3);
8. codeTx4 = hadamardmat(:,4);
9. codeTx5 = hadamardmat(:,5);
10. codeTx6 = hadamardmat(:,6);
11. codeTx7 = hadamardmat(:,7);
12. codeTx8 = hadamardmat(:,8);
13. code_Tx9 = hadamardmat(:,9);
14. code_Tx10 = hadamardmat(:,10);
15. code_Tx11 = hadamardmat(:,11);
16. code_Tx12 = hadamardmat(:,12);
17. code_Tx13 = hadamardmat(:,13);
18. code_Tx14 = hadamardmat(:,14);
19. code_Tx15 = hadamardmat(:,15);
20. code_Tx16 = hadamardmat(:,16);
21. scm = [codeTx1 codeTx2 codeTx3 codeTx4 codeTx5 codeTx6 codeTx7 codeTx8 code_Tx9 code_Tx10 code_Tx11 code_Tx12 code_Tx13 code_Tx14 code_Tx15 code_Tx16];
22. sc_t = scm;
23. sc_t(sc_t == -1) = 0;
24. sc_o=sc_t;
25. no_oftags = 5;
26. out_array = zeros(no_oftags,16);
27. for n = 1:no_oftags
28. out_array(n,:) = xor(tag_arr(1,n),sc_t(n,:));
29. end
30. tau = zeros(1,no_oftags);
31. sigma = 1;
32. for n = 1:no_oftags
33. tau(1,n) = sigma*sqrt(-2*log(1-rand(1)));
34. end
35. volts_forall = zeros(no_oftags,16);
36. for n = 1:no_oftags
37. volts_forall(n,:) = ((-5 + 10*(out_array(n,:)*tau(1,n))));
38. end
39. volts_add = zeros(1,16);
40. for n = 1:no_oftags
41. volts_add(1,:) = volts_add + (volts_forall(n,:));
42. end
43. voltsadd_val = volts_add;
44. voltsadd_val(voltsadd_val>=0) = 1;
45. voltsadd_val(voltsadd_val<0) = 0;

I am trying a code where I have to simple make all the positive values to 1 and negative values to 0 in voltsadd_val matrix but whenever i run the program the syntax doesnt work prroperly. I dont know whats wrong ..

eg

volts_add =

Columns 1 through 11

10.2478 11.0875 8.3853 -11.0500 14.2229 15.0626 12.3604 -7.0749 10.2478 11.0875 8.3853

Columns 12 through 16

-11.0500 14.2229 15.0626 12.3604 -7.0749

voltsadd_val =

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Answer 1

[Kevin Phung]

here's an example:

voltsadd_val = [1 5 3; -2 -5 5; 1 -5 3];
voltsadd_val(voltsadd_val>0) = 1; % if pos, 1
voltsadd_val(voltsadd_val<0) = 0; % if neg, 0

[madhan ravi]

Suspect the OP did the same thing not sure why the OP says it doesn’t work though. Maybe more expanation is needed then.

[Ayesha Punjabi]

I tried running the code with the syntax mentioned above but its just not showing the required results like in this case the last bit is negative but its showing as the output.

I tried with many ways but I am not sure y its showing such result

Answer 2

[Walter Roberson]

voltsadd_val = volts_add >= 0;

No logical indexing required.