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quadratic_function.h
1 /* Copyright (C) 2004-2014 MBSim Development Team
2  *
3  * This library is free software; you can redistribute it and/or
4  * modify it under the terms of the GNU Lesser General Public
5  * License as published by the Free Software Foundation; either
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8  * This library is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11  * Lesser General Public License for more details.
12  *
13  * You should have received a copy of the GNU Lesser General Public
14  * License along with this library; if not, write to the Free Software
15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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17  * Contact: martin.o.foerg@gmail.com
18  */
19 
20 #ifndef _QUADRATIC_FUNCTION_H_
21 #define _QUADRATIC_FUNCTION_H_
22 
23 #include "mbsim/functions/function.h"
24 
25 namespace MBSim {
26 
27  template<typename Sig> class QuadraticFunction;
28 
29  template<typename Ret, typename Arg>
30  class QuadraticFunction<Ret(Arg)> : public Function<Ret(Arg)> {
32  private:
33  double a0, a1, a2;
34  public:
35  QuadraticFunction(double a2_=0) : a0(0), a1(0), a2(a2_) { }
36  QuadraticFunction(double a1_, double a2_) : a0(0), a1(a1_), a2(a2_) { }
37  QuadraticFunction(double a0_, double a1_, double a2_) : a0(a0_), a1(a1_), a2(a2_) { }
38  Ret operator()(const Arg &x_) {
39  double x = ToDouble<Arg>::cast(x_);
40  return FromDouble<Ret>::cast(a0+(a1+a2*x)*x);
41  }
42  typename B::DRetDArg parDer(const Arg &x_) {
43  double x = ToDouble<Arg>::cast(x_);
44  return FromDouble<Ret>::cast(a1+2.*a2*x);
45  }
46  typename B::DRetDArg parDerDirDer(const Arg &xDir_, const Arg &x) {
47  double xDir = ToDouble<Arg>::cast(xDir_);
48  return FromDouble<Ret>::cast(2.*a2*xDir);
49  }
50  Ret parDerParDer(const double &x) {
51  return FromDouble<Ret>::cast(2.*a2);
52  }
53  void initializeUsingXML(xercesc::DOMElement *element) {
54  xercesc::DOMElement *e=MBXMLUtils::E(element)->getFirstElementChildNamed(MBSIM%"a0");
55  if(e) a0=Element::getDouble(e);
56  e=MBXMLUtils::E(element)->getFirstElementChildNamed(MBSIM%"a1");
57  if(e) a1=Element::getDouble(e);
58  e=MBXMLUtils::E(element)->getFirstElementChildNamed(MBSIM%"a2");
59  a2=Element::getDouble(e);
60  }
61  };
62 
63 }
64 
65 #endif
Definition: utils.h:153
Definition: quadratic_function.h:27
Definition: utils.h:197
Definition: planar_contour.h:31

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