While loop if condition

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Braden Kerr
Braden Kerr on 6 Nov 2020
Commented: Braden Kerr on 6 Nov 2020
I have a while loop that I want to run if two conditions are met. I have the while loop and the first condition written out and its below.
A(1,k) = .35; %guess value for alpha^0
epsi = .1;
sigma = 2;
xad = X(:,k)+A(1,k)*D(:,k);
left = fun(xad);
right = fun(X(:,k))+ A(1,k)*epsi*grad_fun(X(:,k))'*D(:,k);
A_2(1,j) = A(1,k);
while (left > right) || (
A_2(1,j+1) = A_2(1,j)/(sigma);
xad = X(:,k)+A_2(1,j+1)*D(:,k);
left = fun(xad);
right = F(1,k)+ (A_2(1,j+1)*epsi*D(:,k)')*D(:,k);
j= j+1;
However, I also want to add a condition for the while loop to run that if left is an imaginary number, to cycle through the loop.
Is this possible? Thank you

Accepted Answer

Sriram Tadavarty
Sriram Tadavarty on 6 Nov 2020
Hi Braden,
You can add these conditions in the while loop.
(~isreal(left)) % To check if left is a complex number
(imag(left) ~= 0) % If the check is only to ensure if there is an imaginary content, implies value could be complex
(imag(left) ~= 0 && real(left) == 0) % If the check is to ensure, it is only imaginary number
The usage of || or && depends on the condition, you wanted. If both the conditions to be met, then use &&. If either of conditions have to be met use ||.
Hope this helps.
  1 Comment
Braden Kerr
Braden Kerr on 6 Nov 2020
Yes, thank you, the top condiditon worked best for what I was trying to do

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