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linear_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
6  * version 2.1 of the License, or (at your option) any later version.
7  *
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
16  *
17  * Contact: martin.o.foerg@gmail.com
18  */
19 
20 #ifndef _LINEAR_FUNCTION_H_
21 #define _LINEAR_FUNCTION_H_
22 
23 #include "mbsim/functions/function.h"
24 
25 namespace MBSim {
26 
27  template<typename Sig> class LinearFunction;
28 
29  template<typename Ret, typename Arg>
30  class LinearFunction<Ret(Arg)> : public Function<Ret(Arg)> {
32  private:
33  double a0, a1;
34  public:
35  LinearFunction(double a1_=0) : a0(0), a1(a1_) { }
36  LinearFunction(double a0_, double a1_) : a0(a0_), a1(a1_) { }
37  int getArgSize() const { return 1; }
38  Ret operator()(const Arg &x) { return FromDouble<Ret>::cast(a1*ToDouble<Arg>::cast(x)+a0); }
39  typename B::DRetDArg parDer(const Arg &x) { return FromDouble<Ret>::cast(a1); }
40  typename B::DRetDArg parDerDirDer(const Arg &xDir, const Arg &x) { return FromDouble<Ret>::cast(0); }
41  Ret parDerParDer(const double &x) { return FromDouble<Ret>::cast(0); }
42  void initializeUsingXML(xercesc::DOMElement *element) {
43  xercesc::DOMElement *e=MBXMLUtils::E(element)->getFirstElementChildNamed(MBSIM%"a0");
44  if(e) a0=Element::getDouble(e);
45  e=MBXMLUtils::E(element)->getFirstElementChildNamed(MBSIM%"a1");
46  a1=Element::getDouble(e);
47  }
48  void seta0(double a0_) { a0 = a0_; }
49  void seta1(double a1_) { a1 = a1_; }
50  };
51 
52 }
53 
54 #endif
Definition: utils.h:153
Definition: utils.h:197
Definition: planar_contour.h:31
Definition: linear_function.h:27

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