MATLAB: ”Conversion to logical from sym is not possible.” Please help

expansionsymbolic

%This is a program on Continuous Fraction Expansion into a proper fraction using MATLAB. My program is attached…
clc; clear all;
syms s y z lo
% s=tf('s')
xy=1+(y*(s-1)/lo);
z=xy;
y=0.5;
lo=7;
n=3;
for m=6:-1:0
    if mod(m,2)==0
          lo=2+((n+y)*(s-1)/lo);
              z=lo;
              n=n-1;
      else
          xy=1+(y*(s-1)/lo);
          lo=m+((n-y)*(s-1)/z);
  %         if m==6
  %                 lo=7;
  %             end
      end
  end
  disp('xy=')
  pretty(xy)
  % tf(xy)
  % tol = 1.e-6*norm(xy(:),1);
  [N,D] = rat(xy);
  % fy=subs(xy,lo,7);
  % disp('fy=')
  % pretty(fy)

Best Answer

You cannot use rat on the class sym. Use simplify instead.
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