I'm having trouble getting my first Matlab code to work? Can anyone tell me what's wrong?

function [x1,x2,errflag] = quadroot(a,b,c)
        if (a == 0)
            error('\nThis equation is not quadratic\n')
        elseif (a ~= 0)
            max_num = max(max(abs(a),abs(b)),abs(c));
            if (max_num ~= 0)
               m=(1/max_num);
               a=m*a;
               b=m*b;
               c=m*c;
            else
               error('\nAll coefficients zero\n')
            end
        D=b^2-4*a*c;
            if (D<0)
               x1=-b/(2*a);
               x2=(sqrt(-D))/(2*a);
               errflag=('x1 is real part, x2 is imaginary part of compex pair');
            elseif (b<0)
               x1=(-b+sqrt(D))/(2*a);
               x2=(c/a*x1);
               errflag=('x1 and x2 are real roots');
            else 
               x1=(-b-sqrt(D))/(2*a);
               x2=(c/a*x1);
               errflag=('x1 and x2 are real roots');
            
            end
        end
end       

Answer 1

[KALYAN ACHARJYA]

1. Save the function as quadroot.m in different Matlab file.
2. Call the function by passing inputs arguments from another main Matlab scripts or from command window (as shown)

[Amanda McGovern]

Thank you but is there something wrong in the code that could explain why it's not working. i get an error regarding if (a == 0) but am not sure why.

[KALYAN ACHARJYA]

If you pass the a=0, then the equation is not quadratic, it not error, it notify the user by forllowing line in the code:

if (a == 0)
   error('\nThis equation is not quadratic\n')

When you pass a=0 to the function, it display the above message