ROL
example_01a.hpp
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56#include "ROL_StdVector.hpp"
57
58using namespace ROL;
59
60template<class Real>
61class Zakharov {
62
63 public:
64
65 template<class ScalarT>
66 ScalarT value(const Vector<ScalarT> &x, Real &tol );
67
68};
69
70
71
82template<class Real>
83template<class ScalarT>
84ScalarT Zakharov<Real>::value(const Vector<ScalarT>& x, Real &tol) {
85
86
87
88 ROL::Ptr<const std::vector<ScalarT> > xp = (dynamic_cast<const StdVector<ScalarT>&>(x)).getVector();
89
90 int n = xp->size();
91
92 ScalarT xdotx = 0;
93 ScalarT kdotx = 0;
94 ScalarT J = 0;
95
96 // Compute dot products
97 for(int i=0; i<n; ++i) {
98 xdotx += pow((*xp)[i],2); // (k,x)
99 kdotx += Real(i+1)*(*xp)[i]; // (x,x)
100 }
101
102 // Sum terms in objective function
103 J = xdotx + pow(kdotx,2)/4.0 + pow(kdotx,4)/16.0;
104
105 return J;
106}
107
108
Provides the ROL::Vector interface for scalar values, to be used, for example, with scalar constraint...
Defines the linear algebra or vector space interface.
Definition: ROL_Vector.hpp:84
ScalarT value(const Vector< ScalarT > &x, Real &tol)
A Sacado-accessible version of the Zakharov function to differentiate.
Definition: example_01a.hpp:84