why the loop is giving repeated array

Attach please find the code . it is repeatedly giving the value where i only want one time random dtheta and it should not repeat the value for 25 times... Thanks

[Stephen23]

Related?:

http://www.mathworks.com/matlabcentral/answers/266687-repetition-of-values-number-of-times

Answer 1

[Guillaume]

You need to learn to debug your program. There are many things wrong with your code:

First problem,

%...
B = 2;
%...
for i = 1:length(B)

length(B) is 1, the i loop is therefore only executed once.

2nd problem,

theta = 0
theta_initial = ones(nrows) * theta

theta is initialised as scalar, theta_initial as vector. Later,:

%...
     theta_inital = theta;

theta_initial goes from being a vector to being a scalar. I'm fairly certain that's not the intention.

3rd problem,

%...
for i = ...
   for j = ...
      theta_new = theta + dtheta(j);
      %bunch of code that only modifies thetha_initial and zeeman_old
      %none of it depends on i
   end

After the j loop, you have in effect

   theta_new = theta + dtheta(100)

regardless of what happens in the loop. Hence the loop is not needed. This is followed by

magnetization_new(i) = magnetization * cosd(theta_new);

So, in effect

magnetization_new(i) = magnetization * cosd(theta + dtheta(100));

for all i.

Reread your code, and if it is not enough for you to spot the mistake step through it using the debugger.

[Offroad Jeep]

Opps, I attached the wrong file.........now i have attached the correct one in which i need correction

[Guillaume]

No file attached, I'm afraid