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RealQuadraticEquation.hpp
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// This file is part of the Acts project.
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//
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// Copyright (C) 2017-2018 CERN for the benefit of the Acts project
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// RealQuadraticEquation.h, Acts project
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#pragma once
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#include <cmath>
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#include <utility>
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namespace
Acts {
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namespace
detail {
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struct
RealQuadraticEquation
{
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double
first
= 0;
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double
second
= 0;
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int
solutions
= 0;
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RealQuadraticEquation
(
double
alpha
,
double
beta,
double
gamma) {
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double
discriminant = beta * beta - 4 * alpha * gamma;
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if
(discriminant >= 0) {
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solutions
= (discriminant == 0) ? 1 : 2;
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double
q = -0.5 * (beta + (beta > 0 ? std::sqrt(discriminant)
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: -std::sqrt(discriminant)));
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first
= q /
alpha
;
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second
= gamma / q;
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}
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}
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};
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}
// namespace detail
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}
// namespace Acts
acts
blob
sPHENIX
Core
include
Acts
Utilities
detail
RealQuadraticEquation.hpp
Built by
Jin Huang
. updated:
Sat Feb 17 2024 22:17:35
using
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