Clipper

abstract base class for leastsquares resolution function target functions More...
#include <resol_fn.h>
Classes  
class  Rderiv 
object holding the residual function and first two derivatives More...  
Public Types  
enum  FNtype { GENERAL, QUADRATIC } 
enumeration of function types: optionally used to improve convergence  
Public Member Functions  
virtual Rderiv  rderiv (const HKL_info::HKL_reference_index &ih, const ftype &fh) const =0 
return the value and derivatives of the target function  
virtual FNtype  type () const 
the type of the function: optionally used to improve convergence  
virtual  ~TargetFn_base () 
destructor  
void  debug (const HKL_info &hkl_info) const 
test that the residuals, gradients, and curvatures are consistent 
abstract base class for leastsquares resolution function target functions
A target function must be able to return its value given the value of the basis function for all HKL, and its derivative with respect the values of the basis function for all HKL.
Optionally, performance can be improved by returning a flag to indicate if the target function is quadratic.
virtual Rderiv clipper::TargetFn_base::rderiv  (  const HKL_info::HKL_reference_index &  ih, 
const ftype &  fh  
)  const [pure virtual] 
return the value and derivatives of the target function
If the value of f(h) is invalid, rderiv.r should be set to NaN
Implemented in clipper::TargetFn_meanFnth< T >, clipper::TargetFn_meanEnth< T >, clipper::TargetFn_scaleF1F2< T1, T2 >, clipper::TargetFn_scaleLogF1F2< T1, T2 >, clipper::TargetFn_scaleI1I2< T1, T2 >, clipper::TargetFn_scaleLogI1I2< T1, T2 >, clipper::TargetFn_scaleEsq< T >, clipper::TargetFn_sigmaa_omegaa< T >, and clipper::TargetFn_sigmaa< T >.
Referenced by clipper::ResolutionFn::calc_derivs(), debug(), and clipper::ResolutionFn_nonlinear::ResolutionFn_nonlinear().