MATLAB: Turning imaginary numbers into real numbers

conversionimaginary

Hello there!
I am attempting to find the points where n = S with the following equations. Whenever S goes into the imaginary plane though, I want it to convert to S = 1. Even though I have a check for that in this code, for some reason MATLAB seems to be ignoring that bit and converting S into 0 instead. How can I fix this?
 for k = 1:1:100
    n = (100 / k);
    s =  sqrt((((.25*(n-(.5*(100-n))))/(n))-.25)/(-((n - .5*(100-n)))/(n)));
    if (0<=s) && (s<=1) 
        s = s;
    elseif s > 1 
        s = 1;
    elseif (isnan(s)==1)
        s = 1;
    elseif (isreal(s)==0)
        s = 1;
    else 
        s = 1;
    end
    RTDlineark{k} = [k]; 
    RTDlinearkn{k} = [n];
    RTDlinearks{k} = [s];
end

Best Answer

To get rid of that, your code can be improved as follows:
   for k = 1:1:100
      n = (100 / k);
      s =  sqrt((((.25*(n-(.5*(100-n))))/(n))-.25)/(-((n - .5*(100-n)))/(n)));
      if (0<s) && (s<=1) 
          s = s;
      elseif s > 1 
          s = 1;
      elseif (real(s)>=0) && imag(s)~=0
          s = 1;
      end
      RTDlineark{k} = [k]; 
      RTDlinearkn{k} = [n];
      RTDlinearks{k} = [s];
  end
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