rnop.hh

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#ifndef __RVL_RNOP
#define __RVL_RNOP

#include "op.hh"
#include "rnmat.hh"

namespace RVL {

  template<typename T, int f(int, int, T const *, T *)>
  class CFunction: public BinaryLocalFunctionObject<T> {
  public:
    void operator()(LocalDataContainer<T> & y,
            LocalDataContainer<T> const & x) {
      int err=0;
      if (err=f(y.getSize(), x.getSize(), x.getData(), y.getData())) {
    RVLException e;
    e<<"Error: CFunction::operator() - err="<<err<<"\n";
    throw e;
      } 
    }
    string getName() const { string tmp = "CFunction"; return tmp; }
  };

  template<typename T, int df(int, int, T const *, T *)>
  class CJacobian: public UnaryLocalFunctionObjectConstEval<T> {
  private:
    GenMat<T> & a;
    CJacobian();
    CJacobian(CJacobian<T, df> const &);
  public:
    CJacobian(GenMat<T> & _a): a(_a) {}
    void operator()(LocalDataContainer<T> const & x) {
      int err=0;
      if (err=df(a.getNRows(), a.getNCols(), x.getData(), a.getData())) {
    RVLException e;
    e<<"Error: CJacobian::operator() - err="<<err<<"\n";
    throw e;
      }
    }
    string getName() const { string tmp = "CJacobian"; return tmp; }
  };

  template<typename T> 
  class OpWithGenMatDeriv: public Operator<T> {
  public:
    virtual GenMat<T> const & getGenMat() const = 0;
  };

  template<typename T, int f(int, int, T const *, T *), int df(int, int, T const *, T *)>
  class GenOp: public OpWithGenMatDeriv<T> {
    
  private:

    // domain and range
    RnSpace<T> const & dom;
    RnSpace<T> const & rng;

    // GenMat matrix LinearOp object and intialization flag,
    // modifiable post-construction
    mutable GenMat<T> deriv;
    mutable bool init;

    // common code for intializing the Jacobian (GenMat object),
    // hoisted out. Note that initialization will be done only once,
    // per the design of Operator.
    void buildJacobian(Vector<T> const & x) const {
      try {
    if (!init) {
      CJacobian<T, df> j(deriv);
      x.eval(j);
      init=true;
    }
      }
      catch (RVLException & e) {
    e<<"\ncalled from GenOp::buildJacobian\n";
    throw e;
      }
    }

    GenOp();

  protected:
    
    virtual void apply(const Vector<T> & x, 
               Vector<T> & y) const {
      try {
    CFunction<T, f> ff;
    y.eval(ff,x);
    // why not
    buildJacobian(x);
      }
      catch (RVLException & e) {
    e<<"\ncalled from GenOp::apply\n";
    throw e;
      }
    }
      
    virtual void applyDeriv(const Vector<T> & x, 
                const Vector<T> & dx,
                Vector<T> & dy) const {
      try {
    buildJacobian(x);
    deriv.applyOp(dx,dy);
      }
      catch (RVLException & e) {
    e<<"\ncalled from GenOp::applyDeriv\n";
    throw e;
      }
    }

    virtual void applyAdjDeriv(const Vector<T> & x, 
                   const Vector<T> & dy,
                   Vector<T> & dx) const {
      try {
    buildJacobian(x);
    deriv.applyAdjOp(dy,dx);
      }
      catch (RVLException & e) {
    e<<"\ncalled from GenOp::applyAdjDeriv\n";
    throw e;
      }
    }    

    virtual Operator<T> * clone() const {
      return new GenOp<T, f, df>(dom,rng);
    }

  public:

    GenOp(RnSpace<T> const & _dom, RnSpace<T> const & _rng)
      : dom(_dom), rng(_rng), deriv(dom,rng), init(false) {}
    GenOp(GenOp<T, f, df> const & a)
      : dom(a.dom), rng(a.rng), deriv(dom,rng), init(false) {}
    
    Space<T> const & getDomain() const { return dom; }
    Space<T> const & getRange() const { return rng; }

    GenMat<T> const & getGenMat() const { 
      if (init) return deriv;
      RVLException e;
      e<<"Error: GenOp::getGenMat\n";
      e<<"Jacobian matrix not initialized - must evaluate somewhere first!\n";
      throw e;
    }

    ostream & write(ostream & str) const {
      str<<"GenOp instance\n";
      str<<"domain:\n";
      dom.write(str);
      str<<"range:\n";
      rng.write(str);
      return str; 
    }
  };

}

#endif

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