# dy_consys.h

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    00001 /*
    00002   This file is a portion of the Dylp LP distribution.
    00003
    00004         Copyright (C) 2005 -- 2007 Lou Hafer
    00005
    00006         School of Computing Science
    00007         Simon Fraser University
    00008         Burnaby, B.C., V5A 1S6, Canada
    00009         lou@cs.sfu.ca
    00010
    00011   This code is licensed under the terms of the Eclipse Public License (EPL).
    00012 */
    00013
    00014 #ifndef _CONSYS_H
    00015 #define _CONSYS_H
    00016
    00017 /*
    00018   @(#)dy_consys.h       4.4     11/11/04
    00019   svn/cvs: $Id: dy_consys.h 407 2010-12-31 20:48:48Z lou $
    00020
    00021   This header file contains declarations for a constraint system data
    00022   structure, tailored for LP-based branch-and-cut MILP algorithms (more
    00023   generally, for any situation where dynamic change in the number of rows
    00024   and/or columns is expected). The constraint system allows for arbitrary
    00025   additions and deletions. Additional space is allocated as needed; there are
    00026   no a priori limits. Allocated space is never reduced, however, short of
    00027   destroying the constraint system.
    00028
    00029   The coefficient matrix is implemented as a sparse structure, linked by row
    00030   and by column. Access to the rows and columns of the coefficient matrix is
    00031   via utility routines.
    00032
    00033   To provide O(1) cost for row and column addition and deletion, while
    00034   maintaining a dense index set, the hole left by deleting a row or column
    00035   is filled by moving the last row or column to occupy the vacant index slot.
    00036
    00037   The client can 'attach' row and column vectors to the constraint system;
    00038   more precisely, vectors and multiple pointers to those vectors.  The
    00039   vectors will be dynamically resized and pointers updated whenever rows
    00040   or columns are added to the constraint system. Entries in attached vectors
    00041   are automatically reordered when a row or column is moved to fill the hole
    00042   left by a deletion.
    00043
    00044   The user is expected to work directly with any attached vectors; there are
    00045   no special access routines.
    00046
    00047   Because rows and columns can move, clients must be careful when they keep
    00048   records of row or column indices, and update these records as necessary.
    00049
    00050   A special set of attached vectors are referred to as associated vectors.
    00051   These are distinguished only by having pointers allocated in the constraint
    00052   system header structure.
    00053
    00054   NOTE: The package assumes that variables and constraints are indexed from
    00055         1; this makes error checking a lot more reliable, particularly for
    00056         errors of omission (whoops, forgot to set that index ... ). Vectors
    00057         intended for expanded rows or columns must be sized accordingly.
    00058         (I.e., if vector is to hold k values, the actual allocated space
    00059         is k+1 entries, with vector[0] unused.) consys will do this
    00060         automatically when asked to allocate space. Clients must remember
    00061         this when allocating space for vectors that they will attach to a
    00062         constraint system.
    00063
    00064   NOTE: The constraint system is prepared to deal with both finite (most
    00065         often DBL_MAX) and infinite (IEEE) infinity in the upper and lower
    00066         bounds vectors for variables (vlb, vub). Explicit checks are
    00067         necessary to maintain the value of a finite infinity when scaling the
    00068         constraint system. The value of infinity must be supplied as a
    00069         parameter to create_consys(). It's not a good idea to have infinity
    00070         popping up elsewhere, but IEEE infinity should work (because no
    00071         explicit checks are required for mathematical correctness).
    00072
    00073   NOTE: At the infinitesimal end, any coefficient with absolute value less
    00074         than 1.0e-20 will be dropped. Currently this is hardwired (see
    00075         consys_create). It may change if there's a need.
    00076 */
    00077
    00078 #include "dy_vector.h"
    00079
    00080
    00081
    00082 /*
    00083   Constraint coefficient matrix
    00084
    00085   This is a sparse-matrix data structure, linked by row and column.
    00086
    00087   Note that rows and columns are << not >> sorted in index order. Insertions
    00088   and deletions are done adjacent to the headers, for efficiency.
    00089 */
    00090 /*
    00091   Coefficients
    00092
    00093   Field         Description
    00094   -----         -----------
    00095   rowhdr        The row header for this coefficient.
    00096   colhdr        The column header for this coefficient.
    00097   val           The value of this coefficient.
    00098   rownxt        The next coefficient in this row.
    00099   colnxt        The next coefficient in this column.
    00100 */
    00101
    00102 typedef struct coeff_struct_tag
    00103 { struct rowhdr_struct_tag *rowhdr ;
    00104   struct colhdr_struct_tag *colhdr ;
    00105   double val ;
    00106   struct coeff_struct_tag *rownxt ;
    00107   struct coeff_struct_tag *colnxt ; } coeff_struct ;
    00108
    00109 /*
    00110   Column headers
    00111
    00112   Field         Description
    00113   -----         -----------
    00114   ndx           The index of this column.
    00115   len           The number of coefficients in the column.
    00116   nme           The name of the variable associated with the column.
    00117   coeffs        The coefficients of the column.
    00118 */
    00119
    00120 typedef struct colhdr_struct_tag
    00121 { int ndx ;
    00122   int len ;
    00123   const char *nme ;
    00124   coeff_struct *coeffs ; } colhdr_struct ;
    00125
    00126 /*
    00127   Row headers
    00128
    00129   Field         Description
    00130   -----         -----------
    00131   ndx           The index of this row.
    00132   len           The number of coefficients in the row.
    00133   nme           The name of the variable associated with the row.
    00134   coeffs        The coefficients of the row.
    00135 */
    00136
    00137 typedef struct rowhdr_struct_tag
    00138 { int ndx ;
    00139   int len ;
    00140   const char *nme ;
    00141   coeff_struct *coeffs ; } rowhdr_struct ;
    00142
    00143 /*
    00144   Coefficient matrix header
    00145
    00146   Field         Definition
    00147   -----         ---------
    00148   coeffcnt      The number of coefficients in the matrix.
    00149   cols          Array of pointers to column headers.
    00150   rows          Array of pointers to row headers.
    00151 */
    00152
    00153 typedef struct
    00154 { int coeffcnt ;
    00155   colhdr_struct **cols ;
    00156   rowhdr_struct **rows ; } conmtx_struct ;
    00157
    00158
    00159
    00160 /*
    00161   Attached Vectors:
    00162
    00163   As mentioned at the top, attached vectors are automatically resized whenever
    00164   the constraint system is resized, and reorderd to track the movement of rows
    00165   and columns due to deletions.
    00166
    00167   A particular subset of attached vectors are designated as associated
    00168   vectors; a system has at most one of each type of associated vector.
    00169   Their only distinguishing characteristic is that they occupy the dedicated
    00170   pointers in the constraint system header:
    00171    * objective function
    00172    * variable type <3>
    00173    * variable upper & lower bounds
    00174    * right-hand-side (a.k.a. rhs or b) and rhsl (a.k.a. rhslow or blow) <1>
    00175    * constraint type
    00176    * upper & lower bounds for constraint left-hand-sides <2>
    00177    * row and column scaling vectors (more accurately, the diagonal elements
    00178      of row and column scaling matrices)
    00179
    00180    <1> rhsl is created when range constraints (blow <= ax <= b) are present
    00181        in the constraint system.
    00182    <2> These are calculated using the upper and lower bounds on the variables
    00183        in the constraint, and are used in arc consistency calculations. See
    00184        further explanation below.
    00185    <3> Arguably the variable type vector only needs to cover the architectural
    00186        variables, but it'd be a pain to distinguish a resize involving the
    00187        architectural columns from a resize involving the logical columns.
    00188        Easier to waste a little space.
    00189
    00190   The flags given below are used in attached vector headers to indicate
    00191   how a vector should be handled, and in the consys_struct.parts field to
    00192   indicate which components of the constraint system are present. Their
    00193   most important function is to specify whether a vector is a row vector
    00194   or a column vector. Beyond that, they serve as weak consistency and type
    00195   checks.
    00196
    00197   Notes:
    00198   * MTX, ROWHDR, and COLHDR cannot be allocated/deallocated, but having
    00199     codes for them makes the interface to some of the utility routines a
    00200     bit more uniform.
    00201   * COL and ROW should be used for generic column and row vectors,
    00202     respectively.
    00203   * VUB is initialised to +infinity.
    00204   * RSCALE and CSCALE are initialised to 1.0
    00205   * VTYP and CTYP are tied to the vartyp_enum and contyp_enum types.
    00206 */
    00207
    00208 #define CONSYS_MTX      ((flags) 1<<0)
    00209 #define CONSYS_ROW      ((flags) 1<<1)
    00210 #define CONSYS_COL      ((flags) 1<<2)
    00211 #define CONSYS_OBJ      ((flags) 1<<3)
    00212 #define CONSYS_VUB      ((flags) 1<<4)
    00213 #define CONSYS_VLB      ((flags) 1<<5)
    00214 #define CONSYS_RHS      ((flags) 1<<6)
    00215 #define CONSYS_CUB      ((flags) 1<<7)
    00216 #define CONSYS_CLB      ((flags) 1<<8)
    00217 #define CONSYS_RHSLOW   ((flags) 1<<9)
    00218 #define CONSYS_VTYP     ((flags) 1<<10)
    00219 #define CONSYS_CTYP     ((flags) 1<<11)
    00220 #define CONSYS_COLHDR   ((flags) 1<<12)
    00221 #define CONSYS_ROWHDR   ((flags) 1<<13)
    00222 #define CONSYS_RSCALE   ((flags) 1<<14)
    00223 #define CONSYS_CSCALE   ((flags) 1<<15)
    00224
    00225 /*
    00226   Macros to identify row and column vectors.
    00227 */
    00228 #define CONSYS_ROWVEC \
    00229   (CONSYS_OBJ|CONSYS_VUB|CONSYS_VLB|CONSYS_VTYP|CONSYS_CSCALE| \
    00230    CONSYS_COLHDR|CONSYS_ROW)
    00231
    00232 #define CONSYS_COLVEC \
    00233   (CONSYS_RHS|CONSYS_RHSLOW|CONSYS_CUB|CONSYS_CLB|CONSYS_CTYP|CONSYS_RSCALE| \
    00234    CONSYS_ROWHDR|CONSYS_COL)
    00235
    00236 /*
    00237   A macro to check for a valid vector type.
    00238 */
    00239
    00240 #define VALID_ATTVTYPE(zz_vectype_zz) \
    00241   (zz_vectype_zz == CONSYS_OBJ || \
    00242    zz_vectype_zz == CONSYS_VUB || zz_vectype_zz == CONSYS_VLB || \
    00243    zz_vectype_zz == CONSYS_RHS || zz_vectype_zz == CONSYS_RHSLOW || \
    00244    zz_vectype_zz == CONSYS_CUB || zz_vectype_zz == CONSYS_CUB || \
    00245    zz_vectype_zz == CONSYS_VTYP || zz_vectype_zz == CONSYS_CTYP || \
    00246    zz_vectype_zz == CONSYS_RSCALE || zz_vectype_zz == CONSYS_CSCALE || \
    00247    zz_vectype_zz == CONSYS_ROW || zz_vectype_zz == CONSYS_COL)
    00248
    00249
    00250 /*
    00251   Attached vector header
    00252
    00253   This structure is used in the list of attached vectors that should be
    00254   checked and resized with the constraint system.
    00255
    00256   Field         Definition
    00257   -----         ----------
    00258   nxt           List link.
    00259   what          The type of vector (coded with the flag values for
    00260                 attached and associated vectors)
    00261   elsze         The size of an element in the vector.
    00262   vec           The address of the vector.
    00263   pveclst       A list of addresses which hold pointers to vec. If vec is
    00264                 moved as a result of a resize, these are rewritten.
    00265 */
    00266
    00267 typedef struct attvhdr_struct_tag { struct attvhdr_struct_tag *nxt ;
    00268                                     flags what ;
    00269                                     int elsze ;
    00270                                     void *vec ;
    00271                                     lnk_struct *pveclst ; } attvhdr_struct ;
    00272
    00273 /*
    00274   Constraint bounds
    00275
    00276   Constraint bounds are upper and lower bounds on the value of the
    00277   left-hand-side of a constraint, calculated using the upper and lower bounds
    00278   on variables. In the case where all variables have finite bounds, the
    00279   constraint bound will also be finite, and things are straightforward. But
    00280   there's a complication --- we'll want to be able to efficiently handle the
    00281   case where all variables have finite bounds except one, x<t>. In this case
    00282   we can calculate a finite bound for the free variable, using the bounds on
    00283   the other variables. Bottom line is we need a structure that keeps count of
    00284   the number of infinities, as well as the finite portion of the bound. See
    00285   consistency.c for more about the mechanics of particular cases.
    00286
    00287   The interpretation of an entry is as follows:
    00288     -varcnt <= inf < 0  inf is the negative of the index of the single
    00289                         remaining variable contributing an infinity; bnd is
    00290                         the finite lhs bound calculated from the other
    00291                         variables of the constraint
    00292     inf >= 0            inf is the number of variables contributing infinity
    00293                         to the bound; bnd is the value of the finite portion
    00294                         of the lhs bound. If inf == 0, the lhs bound is finite.
    00295
    00296     inf < -varcnt and inf = 1 are invalid. A value which exceeds the number of
    00297     variables in the constraint is also bogus.
    00298
    00299   This encoding means that it's impossible to distinguish +inf and -inf just
    00300   by looking at the bound. But, in the case of constraint bounds, this hasn't
    00301   been a problem in practice. Lower bounds go to -inf, and upper bounds go to
    00302   +inf, and context has been sufficient.
    00303
    00304   The revs field is used to keep track of the number of times the bound has
    00305   been revised. See milp.h:mipopts_struct for the recalculation frequency.
    00306 */
    00307
    00308 typedef struct { int revs ;
    00309                  int inf ;
    00310                  double bnd ; } conbnd_struct ;
    00311
    00312
    00313
    00314 /*
    00315   Constraint type codes
    00316
    00317   These codes have their origin in the MPS input standard.
    00318
    00319   contypINV     invalid
    00320   contypNB      non-binding constraint <1>
    00321   contypGE      >= inequality
    00322   contypEQ      equality
    00323   contypLE      <= inequality
    00324   contypRNG     'range' constraint, lb <= ax <= ub (a sort of shorthand for
    00325                 a >= and a <= inequality)
    00326
    00327   <1> Non-binding constraints are a bit odd. They are used in two ways.
    00328       The first non-binding constraint in the MPS file is, by convention,
    00329       the objective function. The other use for non-binding constraints is
    00330       in rows of type Dx (x one of N, E, G, or L), which specify linear
    00331       combinations of constraints.
    00332   <2> Following OSL (a good lead to follow when they're going where I want to
    00333       go  :-), bonsai doesn't accept Dx rows, and throws away all but the
    00334       first non-binding constraint, which it keeps only if it needs it for
    00335       the objective function.
    00336 */
    00337
    00338 typedef enum { contypINV = 0, contypNB,
    00339                contypGE, contypEQ, contypLE, contypRNG } contyp_enum ;
    00340
    00341 #define VALID_CONTYPE(zz_ctyp_zz) \
    00342   (zz_ctyp_zz == contypGE || zz_ctyp_zz == contypEQ || \
    00343    zz_ctyp_zz == contypLE || zz_ctyp_zz == contypRNG)
    00344
    00345 /*
    00346   Variable type codes
    00347
    00348   vartypINV     invalid
    00349   vartypCON     continuous variable
    00350   vartypINT     general integer variable
    00351   vartypBIN     binary variable
    00352 */
    00353
    00354 typedef enum { vartypINV = 0, vartypCON,
    00355                vartypINT, vartypBIN } vartyp_enum ;
    00356
    00357 #define VALID_VARTYPE(zz_vtyp_zz) \
    00358   (zz_vtyp_zz == vartypCON || \
    00359    zz_vtyp_zz == vartypINT || \
    00360    zz_vtyp_zz == vartypBIN)
    00361
    00362 #define INT_VARTYPE(zz_vtyp_zz) \
    00363   (zz_vtyp_zz == vartypINT || \
    00364    zz_vtyp_zz == vartypBIN)
    00365
    00366 /*
    00367   Behavioural options
    00368
    00369   These codes are used as flags in the opts field of the constraint system
    00370   header.
    00371
    00372   CONSYS_LVARS  Set to indicate that logical variables are present and should
    00373                 be automatically maintained during constraint system
    00374                 manipulations.
    00375   CONSYS_WRNZERO Set to indicate that a warning should be issued when the
    00376                 constraint system utility routines encounter a zero-length
    00377                 column or row. Also causes a warning during row/column
    00378                 creation and basis initialisation if an explicit zero
    00379                 coefficient is encountered.
    00380   CONSYS_WRNATT Set to indicate that a warning should be issued when a
    00381                 duplicate attach request is encountered (i.e., both the
    00382                 vector and the pointer to the vector are already on the
    00383                 attvecs list).
    00384   CONSYS_FININF `Finite infinity' --- the client is indulging in the common
    00385                 trick of using a large finite value (most often, DBL_MAX) as
    00386                 infinity.
    00387   CONSYS_CORRUPT The constraint system is corrupt --- an error has occurred
    00388                 during construction or modification that caused an operation
    00389                 to abort. Currently set only for errors that occur outside of
    00390                 debug and paranoia (you're supposed to look at the error
    00391                 messages for paranoia and debug).
    00392 */
    00393
    00394 #define CONSYS_LVARS    ((flags) 1<<0)
    00395 #define CONSYS_WRNZERO  ((flags) 1<<1)
    00396 #define CONSYS_WRNATT   ((flags) 1<<2)
    00397 #define CONSYS_FININF   ((flags) 1<<3)
    00398 #define CONSYS_CORRUPT  ((flags) 1<<4)
    00399
    00400 /*
    00401   Constraint system header
    00402
    00403   The top-level 'handle' for the structure.
    00404
    00405   Field         Definition
    00406   -----         ---------
    00407   nme           The name assigned to this constraint system.
    00408   parts         Flags indicating which components of the constraint system are
    00409                 supposed to be present.
    00410   opts          Flags indicating various behavioural options.
    00411   inf           The value of infinity.
    00412   tiny          The value of the infinitesimal.
    00413   varcnt        The total number of variables (and the column dimension).
    00414   archvcnt      The number of architectural variables. The number of continuous
    00415                 architectural variables is archvcnt-(intvcnt+binvcnt).
    00416   logvcnt       The number of logical variables.
    00417   intvcnt       The number of general integer variables.
    00418   binvcnt       The number of binary variables.
    00419   maxcollen     The number of coefficients in the largest column.
    00420   maxcolndx     The index of the largest column.
    00421   concnt        The total number of constraints (and the row dimension).
    00422   archccnt      The number of architectural constraints.
    00423   cutccnt       The number of cut constraints.
    00424   maxrowlen     The number of coefficients in the largest row.
    00425   maxrowndx     The index of the largest row.
    00426   colsze        The allocated column capacity for the constraint system.
    00427   rowsze        The allocated row capacity for the constraint system.
    00428   mtx           The constraint matrix header.
    00429
    00430     The vectors rowscale and colscale are valid only after execution of one
    00431     of the scaling routines consys_geomscale, consys_equiscale, or
    00432     consys_applyscale. The fields maxaij and minaij are valid only after
    00433     execution of consys_evalsys or any of the scaling routines.
    00434
    00435   maxaij        max{i,j} |a<ij>| (valid only after scaling)
    00436   minaij        min{i,j, a<ij> != 0} |a<ij>| (valid only after scaling)
    00437   rowscale      The row scaling vector.
    00438   colscale      The column scaling vector.
    00439
    00440   objnme        The name of the objective function.
    00441   objndx        Index of the objective function, if it's installed as a
    00442                 constraint cx - x<z> = 0.
    00443   xzndx         Index of the variable x<z>.
    00444   obj           The objective function.
    00445   vtyp          The type of variable.
    00446   vub           The upper bounds for variables.
    00447   vlb           The lower bounds for variables.
    00448   rhs           The right-hand-side vector.
    00449   rhslow        blow for range constraints of form blow <= ax <= b.
    00450   ctyp          The type of constraint (contyp_enum).
    00451   cub           The upper bounds for constraint left-hand-sides.
    00452   clb           The lower bounds for constraint left-hand sides.
    00453   attvecs       The list of attached vectors.
    00454
    00455   NOTE the distinction between dimension and size -- the allocated capacity
    00456        of the constraint system is [rowsze x colsze], while the actual size
    00457        of the constraint system is [concnt x varcnt].
    00458 */
    00459
    00460 typedef struct
    00461 { const char *nme ;
    00462   flags parts ;
    00463   flags opts ;
    00464   double inf ;
    00465   double tiny ;
    00466   int varcnt ;
    00467   int archvcnt ;
    00468   int logvcnt ;
    00469   int intvcnt ;
    00470   int binvcnt ;
    00471   int maxcollen ;
    00472   int maxcolndx ;
    00473   int concnt ;
    00474   int archccnt ;
    00475   int cutccnt ;
    00476   int maxrowlen ;
    00477   int maxrowndx ;
    00478   int colsze ;
    00479   int rowsze ;
    00480   conmtx_struct mtx ;
    00481   double maxaij ;
    00482   double minaij ;
    00483   double *rowscale ;
    00484   double *colscale ;
    00485   const char *objnme ;
    00486   int objndx ;
    00487   int xzndx ;
    00488   double *obj ;
    00489   vartyp_enum *vtyp ;
    00490   double *vub ;
    00491   double *vlb ;
    00492   double *rhs ;
    00493   double *rhslow ;
    00494   contyp_enum *ctyp ;
    00495   conbnd_struct *cub ;
    00496   conbnd_struct *clb ;
    00497   attvhdr_struct *attvecs ; } consys_struct ;
    00498
    00499
    00500
    00501 /*
    00502   consys_utils.c
    00503 */
    00504
    00505 extern consys_struct *consys_create(const char *nme, flags parts, flags opts,
    00506                                     int concnt, int varcnt, double infinity) ;
    00507 extern bool consys_dupsys(consys_struct *src, consys_struct **dst,
    00508                           flags dstvecs) ;
    00509 extern void consys_free (consys_struct *consys) ;
    00510 extern bool consys_realloc(consys_struct *consys, char rowcol, int incr),
    00511             consys_attach(consys_struct *consys, flags what, int elsze,
    00512                           void **pvec),
    00513             consys_update(consys_struct *consys, void *oldvec, void *newvec),
    00514             consys_detach(consys_struct *consys, void **pvec, bool all) ;
    00515
    00516 extern bool consys_addcol_pk(consys_struct *consys,
    00517                              vartyp_enum vartyp, pkvec_struct *pkcol,
    00518                              double obj, double vlb, double vub),
    00519             consys_addcol_ex(consys_struct *consys, vartyp_enum vartyp,
    00520                              const char **nme, double *excol,
    00521                              double obj, double vlb, double vub),
    00522             consys_addrow_pk(consys_struct *consys, char rowclass,
    00523                              contyp_enum contyp, pkvec_struct *pkrow,
    00524                              double rhs, double rhslow,
    00525                              conbnd_struct *cub, conbnd_struct *clb),
    00526             consys_getcol_pk(consys_struct *consys, int colndx,
    00527                              pkvec_struct **pkvec),
    00528             consys_getcol_ex(consys_struct *consys, int colndx, double **vec),
    00529             consys_getrow_pk(consys_struct *consys, int rowndx,
    00530                              pkvec_struct **pkvec),
    00531             consys_getrow_ex(consys_struct *consys, int rowndx, double **vec),
    00532             consys_delcol(consys_struct *consys, int colndx),
    00533             consys_delrow(consys_struct *consys, int rowndx),
    00534             consys_delrow_stable(consys_struct *consys, int rowndx) ;
    00535
    00536 extern bool consys_setcoeff(consys_struct *consys,
    00537                             int rowndx, int colndx, double val) ;
    00538 extern double consys_getcoeff(consys_struct *consys, int rowndx, int colndx) ;
    00539
    00540 extern bool consys_logicals(consys_struct *consys) ;
    00541
    00542 /*
    00543   consys_mathutils.c
    00544 */
    00545
    00546 extern int consys_gcdrow(consys_struct *consys, int rowndx) ;
    00547
    00548 extern double consys_dotcol(consys_struct *consys, int colndx, double *vec),
    00549               consys_dotrow(consys_struct *consys, int rowndx, double *vec) ;
    00550 extern double consys_1normrow(consys_struct *consys, int rowndx),
    00551               consys_ssqrow(consys_struct *consys, int rowndx),
    00552               consys_2normrow(consys_struct *consys, int rowndx),
    00553               consys_infnormrow(consys_struct *consys, int rowndx),
    00554               consys_1normcol(consys_struct *consys, int rowndx),
    00555               consys_ssqcol(consys_struct *consys, int rowndx),
    00556               consys_2normcol(consys_struct *consys, int rowndx),
    00557               consys_infnormcol(consys_struct *consys, int rowndx) ;
    00558
    00559 extern bool consys_mulrow(consys_struct *consys, int rowndx, double scalar) ;
    00560 extern bool consys_divrow(consys_struct *consys, int rowndx, double scalar) ;
    00561
    00562 extern bool consys_accumcol(consys_struct *consys, int colndx, double *vec) ;
    00563 extern bool consys_mulaccumcol(consys_struct *consys, int colndx,
    00564                                double scalar, double *vec) ;
    00565
    00566 /*
    00567   consys_scaling.c
    00568 */
    00569
    00570 extern bool consys_evalsys(consys_struct *consys, double *scm, int *gecnt) ;
    00571 extern bool consys_geomscale(consys_struct *consys,
    00572                              double **rowscale, double **colscale),
    00573             consys_equiscale(consys_struct *consys,
    00574                              double **rowscale, double **colscale),
    00575             consys_applyscale(consys_struct *consys, bool convctyp,
    00576                               double *rowscale, double *colscale) ;
    00577
    00578 /*
    00579   consys_io.c
    00580 */
    00581
    00582 extern const char *consys_prtvartyp(vartyp_enum vartyp),
    00583                   *consys_prtcontyp(contyp_enum contyp) ;
    00584 extern char *consys_assocnme(consys_struct *consys, flags which),
    00585             *consys_conbndnme(char bndlett, int cndx, conbnd_struct *bnd),
    00586             *consys_conbndval(conbnd_struct *bnd) ;
    00587
    00588 #ifndef DYLP_NDEBUG
    00589
    00590 #include "dylib_io.h"
    00591 #include "dylib_std.h"
    00592
    00593 extern void consys_prtcon(ioid chn, bool echo,
    00594                           consys_struct *consys, int i, const char *pfx) ;
    00595 #endif
    00596
    00597 /*
    00598   A routine to set (change, really) the name of an existing constraint or
    00599   variable.
    00600 */
    00601
    00602 extern void consys_chgnme(consys_struct *consys, char cv,
    00603                           int ndx, const char *newnme) ;
    00604
    00605 /*
    00606   consys_nme returns a string containing the name of the specified constraint
    00607   or variable. If the client supplies a buffer, that buffer is used to return
    00608   the name. If a buffer isn't supplied, a little care is required.
    00609     * If consys_nme can find a pointer to the name stored in the constraint
    00610       matrix (i.e., in the row or column header) it will return the stored
    00611       pointer. Successive calls will not interfere with one another.
    00612     * If consys_nme has to build the name, it will use an internal buffer.
    00613       Successive calls will reuse this buffer as required (overwriting the
    00614       previous name).
    00615
    00616   Names have to be built in two cases:
    00617     * A fully prefixed name is requested (a prefix of 'consys->nme.' is
    00618       added to the variable or constraint name).
    00619     * The name of a logical variable is requested and logicals aren't enabled
    00620       in the constraint system.
    00621
    00622   A buffer of size CONSYS_MAXBUFLEN is guaranteed to be adequate.
    00623 */
    00624
    00625 #define CONSYS_MAXBUFLEN 32
    00626 extern const char *consys_nme(consys_struct *consys,
    00627                               char cv, int ndx, bool pfx, char *clientbuf) ;
    00628
    00629
    00630 #endif /* _CONSYS_H */

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