Creating a matrix using loop for and if

Hi In workspace I have matrix A 601x1 double created by Simulink simulation. Now i want to create new matrix B also 601x1 double more less like this. I want the new matrix B be the same as A when its values are smaller than 360, but when the values are greater or equal 360 i want to substract 360. I dont know how to create this B matrix like that. Below is something i used to try but failed.

for k=A(1):1:A(end)
  if A < 360
    B=A
  elseif A >=360
    B=A-360
  end
end

Answer 1

[Guillaume]

A loop is completely unnecessary:

B = A;
B(B>360) = B(B>360) - 360;

Using a loop, this would have been the proper syntax:

B = zeros(size(A)); %always preallocate
for idx = 1 : numel(A)  %your loop indexing was completely wrong
    if A(idx) < 360
       B(idx) = A(idx); %and of course, you must use the index somewhere
    else   %no need for elseif A(idx)>=360, if the 1st condition wasn't true, then the other one obviously is
       B(idx) = A(idx) - 360;
    end
end

Note that if all you want to do is make sure that values in B are between 0 and 360, then:

B = mod(A, 360);

is even simpler.

[Jakub F]

Well, I'll be damned, this

B = mod(A, 360)

is all i needed :) thanks.