MATLAB: Write a quadratic equation function

quadratic

Hi all,
I've been writing a function to solve a quadratic equation of the form ax^2 + bx + c. It works for quadratics where there are two real roots, but I want it to display NA for one of the roots when there is a repeated root or NA for both when there are no real roots. Not sure if I have to use an if statement or an if else statement?
Thanks for any help!

Best Answer

Isn't this just depending on the value of b^2-4*a*c, something like
val = b^2-4*a*c;
if val > 0
  % two roots
elseif val == 0
  % one root, one NA
else
  % NA
end
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