Scippy

SCIP

Solving Constraint Integer Programs

expr_entropy.h
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1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2 /* */
3 /* This file is part of the program and library */
4 /* SCIP --- Solving Constraint Integer Programs */
5 /* */
6 /* Copyright (c) 2002-2023 Zuse Institute Berlin (ZIB) */
7 /* */
8 /* Licensed under the Apache License, Version 2.0 (the "License"); */
9 /* you may not use this file except in compliance with the License. */
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21 /* along with SCIP; see the file LICENSE. If not visit scipopt.org. */
22 /* */
23 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24 
25 /**@file expr_entropy.h
26  * @ingroup EXPRHDLRS
27  * @brief handler for -x*log(x) expressions
28  * @author Benjamin Mueller
29  * @author Fabian Wegscheider
30  */
31 
32 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
33 
34 #ifndef __SCIP_EXPR_ENTROPY_H__
35 #define __SCIP_EXPR_ENTROPY_H__
36 
37 
38 #include "scip/scip.h"
39 #include "scip/type_expr.h"
40 
41 #ifdef __cplusplus
42 extern "C" {
43 #endif
44 
45 /** creates the handler for entropy expressions and includes it into SCIP
46  *
47  * @ingroup ExprhdlrIncludes
48  */
49 SCIP_EXPORT
51  SCIP* scip /**< SCIP data structure */
52  );
53 
54 /**@addtogroup EXPRHDLRS
55  *
56  * @{
57  *
58  * @name Entropy value expression
59  *
60  * This expression handler provides the entropy function, that is,
61  * \f[
62  * x \mapsto \begin{cases}
63  * -x\log(x), & \mathrm{if} x > 0,\\
64  * 0, & \mathrm{if} x = 0, \\
65  * \mathrm{undefined}, & \mathrm{else}.
66  * \end{cases}
67  * \f]
68  *
69  * @{
70  */
71 
72 /** creates an entropy expression */
73 SCIP_EXPORT
75  SCIP* scip, /**< SCIP data structure */
76  SCIP_EXPR** expr, /**< pointer where to store expression */
77  SCIP_EXPR* child, /**< child expression */
78  SCIP_DECL_EXPR_OWNERCREATE((*ownercreate)), /**< function to call to create ownerdata */
79  void* ownercreatedata /**< data to pass to ownercreate */
80  );
81 
82 /** indicates whether expression is of entropy-type */
83 SCIP_EXPORT
85  SCIP* scip, /**< SCIP data structure */
86  SCIP_EXPR* expr /**< expression */
87  );
88 
89 /** @}
90  * @}
91  */
92 
93 #ifdef __cplusplus
94 }
95 #endif
96 
97 #endif /* __SCIP_EXPR_ENTROPY_H__ */
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
SCIP_Bool SCIPisExprEntropy(SCIP *scip, SCIP_EXPR *expr)
Definition: expr_entropy.c:712
SCIP_RETCODE SCIPcreateExprEntropy(SCIP *scip, SCIP_EXPR **expr, SCIP_EXPR *child, SCIP_DECL_EXPR_OWNERCREATE((*ownercreate)), void *ownercreatedata)
Definition: expr_entropy.c:685
#define SCIP_Bool
Definition: def.h:93
#define SCIP_DECL_EXPR_OWNERCREATE(x)
Definition: type_expr.h:140
type and macro definitions related to algebraic expressions
SCIP_RETCODE SCIPincludeExprhdlrEntropy(SCIP *scip)
Definition: expr_entropy.c:653
SCIP callable library.