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Fixed an issue with parenthetical expression around 2*a in quadroots … #9

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Fixed an issue with parenthetical expression around 2*a in quadroots … #9

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13 changes: 9 additions & 4 deletions utils/quadroots.m
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@


function [x1, x2] = quadroots(a, b, c)
% Calculates the roots of the quadratic equation 0 = a*x^2 + b*x + c, and
% returns them as a tuple. If a root is repeated, the elements of the tuple
Expand All @@ -17,10 +19,13 @@
% -------
% x1, x2: float
% Roots of the equation.
if nargin==0, test_quadroots; return; end
if nargin==0
test_quadroots;
return
end

x1 = (-b + sqrt(b*b - 4*a*c))/2*a;
x2 = (-b - sqrt(b*b - 4*a*c))/2*a;
x1 = (-b + sqrt(b*b - 4*a*c))/(2*a);
x2 = (-b - sqrt(b*b - 4*a*c))/(2*a);

%%%
function test_quadroots
Expand All @@ -30,4 +35,4 @@
[root1, root2] = quadroots(a, b, c);
root1exact = 2;
root2exact = 0.5;
assert(abs(root1exact - root1) < 1e-14 && abs(root2exact - root2) < 1e-14);
assert((abs(root1exact - root1) < 1e-14) && (abs(root2exact - root2) < 1e-14));
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