1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* */
/* This file is part of the program and library */
/* SCIP --- Solving Constraint Integer Programs */
/* */
/* Copyright 2002-2022 Zuse Institute Berlin */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
/* See the License for the specific language governing permissions and */
/* limitations under the License. */
/* */
/* You should have received a copy of the Apache-2.0 license */
/* along with SCIP; see the file LICENSE. If not visit scipopt.org. */
/* */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/**@file expr_sum.h
* @ingroup EXPRHDLRS
* @brief sum expression handler
* @author Stefan Vigerske
* @author Benjamin Mueller
*/
/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
#ifndef __SCIP_EXPR_SUM_H__
#define __SCIP_EXPR_SUM_H__
#include "scip/scip.h"
#include "scip/type_expr.h"
#ifdef __cplusplus
extern "C" {
#endif
/** creates the handler for sum expressions and includes it into SCIP
*
* @ingroup ExprhdlrIncludes
*/
SCIP_EXPORT
SCIP_RETCODE SCIPincludeExprhdlrSum(
SCIP* scip /**< SCIP data structure */
);
/**@addtogroup EXPRHDLRS
*
* @{
*
* @name Sum expression
*
* This expression handler provides the sum function, that is,
* \f[
* x \mapsto c + \sum_{i=1}^n a_i x_i
* \f]
* for some constant c and constant coefficients \f$a_i\f$.
*
* @{
*/
/** creates a sum expression */
SCIP_EXPORT
SCIP_RETCODE SCIPcreateExprSum(
SCIP* scip, /**< SCIP data structure */
SCIP_EXPR** expr, /**< pointer where to store expression */
int nchildren, /**< number of children */
SCIP_EXPR** children, /**< children */
SCIP_Real* coefficients, /**< array with coefficients for all children (or NULL if all 1.0) */
SCIP_Real constant, /**< constant term of sum */
SCIP_DECL_EXPR_OWNERCREATE((*ownercreate)), /**< function to call to create ownerdata */
void* ownercreatedata /**< data to pass to ownercreate */
);
/** sets the constant of a summation expression */
SCIP_EXPORT
void SCIPsetConstantExprSum(
SCIP_EXPR* expr, /**< sum expression */
SCIP_Real constant /**< constant */
);
/** appends an expression to a sum expression */
SCIP_EXPORT
SCIP_RETCODE SCIPappendExprSumExpr(
SCIP* scip, /**< SCIP data structure */
SCIP_EXPR* expr, /**< sum expression */
SCIP_EXPR* child, /**< expression to be appended */
SCIP_Real childcoef /**< child's coefficient */
);
/** multiplies given sum expression by a constant */
SCIP_EXPORT
void SCIPmultiplyByConstantExprSum(
SCIP_EXPR* expr, /**< sum expression */
SCIP_Real constant /**< constant that multiplies sum expression */
);
/** @}
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* __SCIP_EXPR_SUM_H__ */