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I need to write a script file that takes the coefficients of a quadratic and calculates the roots after testing them so that the least amount of calculation is done?

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Brittany 2014-7-29

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回答： John 2014-7-29

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I have started with a code to simply calculate two roots of a quadratic function:

function [x1, x2] = quadraticRoots(a, b, c)
  % Function to calculate the roots of the quadratic equation:
  %   a*x^2 + b*x + c = 0
  % USAGE: [x1, x2] = quadraticRoots(a, b, c)
  % INPUTS: a, b and c - the three coefficients
  % OUTPUTS: x1 and x2 - the two roots of the equation
s = sqrt(b^2 - 4*a*c);
x1 = (-b+s)/(2*a);
x2 = (-b-s)/(2*a);

but don't know where to go from here?

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Michael Haderlein 2014-7-29

So what's the question? That code should already work.

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John 2014-7-29

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By "testing" them do you mean to check if the coefficients will produce a Real solution as opposed to a complex solution?

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