# ConstrainedOptPack_vector_change_stats.hpp File Reference

#include "ConstrainedOptPack_Types.hpp"

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## Namespaces

namespace  ConstrainedOptPack

## Functions

void vector_change_stats (const DVectorSlice &x, const DVectorSlice &d, value_type *max_term, size_type *max_k, value_type *min_term, size_type *min_k, value_type *av_term)
Compute statistics for change in a vector.

## Function Documentation

 void ConstrainedOptPack::vector_change_stats ( const DVectorSlice & x, const DVectorSlice & d, value_type * max_term, size_type * max_k, value_type * min_term, size_type * min_k, value_type * av_term )
 Compute statistics for change in a vector. Given two vectors x and d where we wish to generate statistics for the update x+d this function computes the following quantitines: max( |d(i)|/(1+|x(i)|), i=1...n ) => #max_k# = k, #max_term# = |d(k)|/(1+|x(k)|) <= 1\ min( |d(i)|/(1+|x(i)|), i=1...n ) => #min_k# = k, #min_term# = |d(k)|/(1+|x(k)|)#\ #average( |d(i)|/(1+|x(i)|), i=1...10 )# => #av_term#\ The purpose of generating these satistics is to determine by how much x+d differs from x. If |d(i)|/|x(i)| < mach_eps with x(i) > 0 then we know that d(i) will be lost when added to x(i) so x(i) + d(i) == x(i). Definition at line 35 of file ConstrainedOptPack_vector_change_stats.cpp.

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