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. */ 10 /* You may obtain a copy of the License at */ 11 /* */ 12 /* http://www.apache.org/licenses/LICENSE-2.0 */ 13 /* */ 14 /* Unless required by applicable law or agreed to in writing, software */ 15 /* distributed under the License is distributed on an "AS IS" BASIS, */ 16 /* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */ 17 /* See the License for the specific language governing permissions and */ 18 /* limitations under the License. */ 19 /* */ 20 /* You should have received a copy of the Apache-2.0 license */ 21 /* along with SCIP; see the file LICENSE. If not visit scipopt.org. */ 22 /* */ 23 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 24 25 /**@file struct_symmetry.h 26 * @brief structs for symmetry computations 27 * @author Marc Pfetsch 28 * @author Christopher Hojny 29 */ 30 31 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ 32 33 #ifndef __SCIP_STRUCT_SYMMETRY_H_ 34 #define __SCIP_STRUCT_SYMMETRY_H_ 35 36 #include "scip/scip.h" 37 #include "symmetry/type_symmetry.h" 38 #include "scip/type_expr.h" 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 /** data to encode a symmetry detection graph */ 45 struct SYM_Graph 46 { 47 /* general information about graph */ 48 SYM_SYMTYPE symtype; /**< type of symmetries encoded in graph */ 49 SCIP_Bool islocked; /**< whether graph is locked, i.e., cannot be modified anymore 50 * (computing colors will lock the graph to avoid inconsistencies) */ 51 SCIP_Real infinity; /**< values as least as large as this are regarded as infinite */ 52 53 /* information about nodes and node arrays */ 54 int nnodes; /**< number of nodes in graph */ 55 int maxnnodes; /**< maximum number of entries in node-based arrays */ 56 int nopnodes; /**< number of operator nodes in graph */ 57 int maxnopnodes; /**< maximum number of entries in operator-based arrays */ 58 int nvalnodes; /**< number of value nodes in graph */ 59 int maxnvalnodes; /**< maximum number of entries in value-based arrays */ 60 int nconsnodes; /**< number of constraint nodes */ 61 int maxnconsnodes; /**< maximum number of constraint-based arrays */ 62 int nvarcolors; /**< number of variable colors */ 63 64 /* node-based arrays */ 65 SYM_NODETYPE* nodetypes; /**< array storing each node's type */ 66 int* nodeinfopos; /**< array assigning each node the position in the corresponding array 67 * containing its information (operator, variable, or value) */ 68 int* consnodeperm; /**< array to hold permutation to sort constraint nodes 69 * (graph needs to be locked to avoid inconsistencies) */ 70 71 /* information-based arrays */ 72 int* ops; /**< operators corresponding to nodes in graph */ 73 SCIP_Real* vals; /**< values corresponding to nodes in graph */ 74 SCIP_CONS** conss; /**< constraints corresponding to cons nodes */ 75 SCIP_Real* lhs; /**< array of left-hand sides for cons nodes */ 76 SCIP_Real* rhs; /**< array of right-hand sides for cons nodes */ 77 78 /* information about edges and edge arrays */ 79 int nedges; /**< number of edges in graph */ 80 int maxnedges; /**< maximum number of entries in edge-based arrays */ 81 82 /* edge-based arrays; negative entries in edge-first and edge-second correspond to variables */ 83 int* edgefirst; /**< array of first nodes of edges */ 84 int* edgesecond; /**< array of second nodes of edges */ 85 SCIP_Real* edgevals; /**< array assigning each edge a value (SCIPinfinity if unassigned) */ 86 87 /* information about variables */ 88 SCIP_VAR** symvars; /**< variables on which symmetries act */ 89 int nsymvars; /**< number of variables in symvars */ 90 SCIP_Bool* isfixedvar; /**< whether a variable needs to be fixed */ 91 92 /* arrays of colors used for symmetry detection */ 93 int* varcolors; /**< variable colors for symmetry detection */ 94 int* opcolors; /**< operator colors for symmetry detection */ 95 int* valcolors; /**< value colors for symmetry detection */ 96 int* conscolors; /**< constraint colors for symmetry detection */ 97 int* edgecolors; /**< edge colors used for symmetry detection (-1 uncolored) */ 98 SCIP_Bool uniqueedgetype; /**< whether all edges are equivalent */ 99 }; 100 101 /** (additional) data used to encode an expression, which is not encoded as another expression */ 102 struct SYM_ExprData 103 { 104 SCIP_Real* constants; /**< constants used in an expression */ 105 int nconstants; /**< number of constants */ 106 SCIP_Real* coefficients; /**< coefficients of children */ 107 int ncoefficients; /**< number of coefficients */ 108 SCIP_EXPR** children; /**< children of expression with a coefficient */ 109 }; 110 111 #ifdef __cplusplus 112 } 113 #endif 114 115 #endif 116