MATLAB: Error: Not Enough Input Arguments

quadratic functionquadroot

"Error using quadroot (line 2). Not enough input arguments" why does it give me this error message? here is my code:
 function [x] = quadroot(a,b,c)
  if a==0
      %special cases
      if b ~= 0
          %single root
          x1 = -c/b;
      else
          %trivial solution
          disp('Trivial solution.')
      end
  else
      %quadratic equatioon
      d  = b^2 - 4*a*c;
      if d>=0
          x1 = (-b + sqrt(d))/(2*a);
          x2 = (-b - sqrt(d))/(2*a);
      else
          x1 = -b/(2*a);
          i1 = sqrt(abs(d))/(2*a);
          x2 = x1;
      end
  end

Best Answer

Because when you called it, or ran it if this is an m-file, you did not supply a, b, and c.
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