mirror of
https://github.com/Z3Prover/z3
synced 2025-04-25 10:05:32 +00:00
94 lines
2 KiB
C++
94 lines
2 KiB
C++
/*++
|
|
Copyright (c) 2017 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
<name>
|
|
|
|
Abstract:
|
|
|
|
<abstract>
|
|
|
|
Author:
|
|
|
|
Lev Nachmanson (levnach)
|
|
|
|
Revision History:
|
|
|
|
|
|
--*/
|
|
|
|
#pragma once
|
|
#include "util/vector.h"
|
|
#include <math.h>
|
|
#include <algorithm>
|
|
#include <stdio.h> /* printf, fopen */
|
|
#include <stdlib.h> /* exit, EXIT_FAILURE */
|
|
#include "math/lp/lp_utils.h"
|
|
#include "math/lp/static_matrix.h"
|
|
namespace lp {
|
|
// for scaling an LP
|
|
template <typename T, typename X>
|
|
class scaler {
|
|
vector<X> & m_b; // right side
|
|
static_matrix<T, X> &m_A; // the constraint matrix
|
|
const T & m_scaling_minimum;
|
|
const T & m_scaling_maximum;
|
|
vector<T>& m_column_scale;
|
|
lp_settings & m_settings;
|
|
public:
|
|
// constructor
|
|
scaler(vector<X> & b, static_matrix<T, X> &A, const T & scaling_minimum, const T & scaling_maximum, vector<T> & column_scale,
|
|
lp_settings & settings):
|
|
m_b(b),
|
|
m_A(A),
|
|
m_scaling_minimum(scaling_minimum),
|
|
m_scaling_maximum(scaling_maximum),
|
|
m_column_scale(column_scale),
|
|
m_settings(settings) {
|
|
lp_assert(m_column_scale.size() == 0);
|
|
m_column_scale.resize(m_A.column_count(), numeric_traits<T>::one());
|
|
}
|
|
|
|
T right_side_balance();
|
|
|
|
T get_balance() { return m_A.get_balance(); }
|
|
|
|
T A_min() const;
|
|
|
|
T A_max() const;
|
|
|
|
T get_A_ratio() const;
|
|
|
|
T get_max_ratio_on_rows() const;
|
|
|
|
T get_max_ratio_on_columns() const;
|
|
|
|
void scale_rows_with_geometric_mean();
|
|
|
|
void scale_columns_with_geometric_mean();
|
|
|
|
void scale_once_for_ratio();
|
|
|
|
bool scale_with_ratio();
|
|
|
|
void bring_row_maximums_to_one();
|
|
|
|
void bring_column_maximums_to_one();
|
|
|
|
void bring_rows_and_columns_maximums_to_one();
|
|
|
|
bool scale_with_log_balance();
|
|
// Returns true if and only if the scaling was successful.
|
|
// It is the caller responsibility to restore the matrix
|
|
bool scale();
|
|
|
|
void scale_rows();
|
|
|
|
void scale_row(unsigned i);
|
|
|
|
void scale_column(unsigned i);
|
|
|
|
void scale_columns();
|
|
};
|
|
}
|