org.gnu.glpk
Class GlpkSolver

java.lang.Object
  org.gnu.glpk.GlpkSolver

public class GlpkSolver
extends java.lang.Object

This is the core class of the Java Native Interface for GLPK 4.8.
Use GLPK in the following way:

      GlpkSolver solver = new GlpkSolver();
      ... fill LP model
      solver.simplex();   // LP solver
      solver.integer();   // ILP solver
      ... obtain results
 

For a detailed manual and the C version of GLPK, take a look at the GLPK Homepage

Field Summary

static int	LPX_B_UNDEF
static int	LPX_B_VALID
static int	LPX_BS
static int	LPX_CV
static int	LPX_D_FEAS
static int	LPX_D_INFEAS
static int	LPX_D_NOFEAS
static int	LPX_D_UNDEF
static int	LPX_DB
static int	LPX_E_BADB
static int	LPX_E_EMPTY
static int	LPX_E_FAULT
static int	LPX_E_INFEAS
static int	LPX_E_INSTAB
static int	LPX_E_ITLIM
static int	LPX_E_NOCONV
static int	LPX_E_NODFS
static int	LPX_E_NOFEAS
static int	LPX_E_NOPFS
static int	LPX_E_OBJLL
static int	LPX_E_OBJUL
static int	LPX_E_OK
static int	LPX_E_SING
static int	LPX_E_TMLIM
static int	LPX_FEAS
static int	LPX_FR
static int	LPX_FX
static int	LPX_I_FEAS
static int	LPX_I_NOFEAS
static int	LPX_I_OPT
static int	LPX_I_UNDEF
static int	LPX_INFEAS
static int	LPX_IV
static int	LPX_K_BRANCH
static int	LPX_K_BTRACK
static int	LPX_K_DUAL
static int	LPX_K_ITCNT
static int	LPX_K_ITLIM
static int	LPX_K_LPTORIG
static int	LPX_K_MPSFREE
static int	LPX_K_MPSINFO
static int	LPX_K_MPSOBJ
static int	LPX_K_MPSORIG
static int	LPX_K_MPSSKIP
static int	LPX_K_MPSWIDE
static int	LPX_K_MSGLEV
static int	LPX_K_OBJLL
static int	LPX_K_OBJUL
static int	LPX_K_OUTDLY
static int	LPX_K_OUTFRQ
static int	LPX_K_PRESOL
static int	LPX_K_PRICE
static int	LPX_K_RELAX
static int	LPX_K_ROUND
static int	LPX_K_SCALE
static int	LPX_K_TMLIM
static int	LPX_K_TOLBND
static int	LPX_K_TOLDJ
static int	LPX_K_TOLINT
static int	LPX_K_TOLOBJ
static int	LPX_K_TOLPIV
static int	LPX_LO
static int	LPX_LP
static int	LPX_MAX
static int	LPX_MIN
static int	LPX_MIP
static int	LPX_NF
static int	LPX_NL
static int	LPX_NOFEAS
static int	LPX_NS
static int	LPX_NU
static int	LPX_OPT
static int	LPX_P_FEAS
static int	LPX_P_INFEAS
static int	LPX_P_NOFEAS
static int	LPX_P_UNDEF
static int	LPX_T_OPT
static int	LPX_T_UNDEF
static int	LPX_UNBND
static int	LPX_UNDEF
static int	LPX_UP

Constructor Summary

GlpkSolver()

Method Summary

void	addCols(int ncs) Add new ncs columns (structural variables) to problem object
void	addRows(int nrs) Add nrs new rows (constraints) to problem object
void	advBasis() Construct advanced initial LP basis
void	checkKkt(int scaled, GlpkSolverKktConditions kkt) Check Karush-Kuhn-Tucker conditions
void	delCols(int ncs, int[] num) Delete ncs columns from problem object
void	delRows(int nrs, int[] num) Delete nrs rows from problem object
int	dualRatioTest(int len, int[] ind, double[] val, int how, double tol) Perform dual ratio test
void	enablePrints(boolean enable)
int	evalTabCol(int k, int[] ind, double[] val) Compute column of the simplex table
int	evalTabRow(int k, int[] ind, double[] val) Compute row of the simplex table
protected void	finalize()
int	getClss() Retrieve problem class
double	getColDual(int j) Retrieve dual value (reduced cost) of the structural variable (column) j
int	getColKind(int j) Retrieve kind of column j
double	getColLb(int j) Retrieve lower bound of column j
java.lang.String	getColName(int j) Retrieve name of column j
double	getColPrim(int j) Retrieve primal value of the structural variable (column) j
int	getColStat(int j) Retrieve status of column j
int	getColType(int j) Retrieve type of column j
double	getColUb(int j) Retrieve upper bound of column j
int	getDualStat() Retrieve dual status of the basic solution
int	getIntParm(int parm) Query integer control parameter
int	getMatCol(int j, int[] ind, double[] val) Retrieve column j of the constraint matrix.
int	getMatRow(int i, int[] ind, double[] val) Retrieve row i of the constraint matrix.
int	getNumBin() Retrieve number of binary columns
int	getNumCols() Retrieve number of columns
int	getNumInt() Retrieve number of integer columns
int	getNumNz() Retrieve number of constraint coefficients (non-zero elements in constraint matrix)
int	getNumRows() Retrieve number of rows
double	getObjCoef(int j) Retrieve objective function coefficient or constant term
int	getObjDir() Retrieve optimization direction flag
java.lang.String	getObjName() Retrieve objective function name
double	getObjVal() Retrieve current value of the objective function
int	getPrimStat() Retrieve primal status of the basic solution
java.lang.String	getProbName() Retrieve problem name
int	getRayInfo() Retrieve non-basic variable which causes unboundness
double	getRealParm(int parm) Query real control parameter
double	getRowDual(int i) Retrieve dual value (reduced cost) of auxiliary variable associated with row i
double	getRowLb(int i) Retrieve lower bound of row i
java.lang.String	getRowName(int i) Retrieve name of row i
double	getRowPrim(int i) Retrieve primal value of auxiliary variable of row i
int	getRowStat(int i) Retrieve status of row i
int	getRowType(int i) Retrieve type of row i
double	getRowUb(int i) Retrieve upper bound of row i
int	getStatus() Retrieve generic status of the basic solution
int	integer() Solve MIP problem using the branch-and-bound method
int	interior() Solve LP problem using the primal-dual interior point method
double	iptColDual(int j) Retrieve dual value (reduced cost) of auxiliary variable associated with column j
double	iptColPrim(int j) Retrieve primal value of structural variable of column j
double	iptObjVal() Retrieve objective value from interior-point solution
double	iptRowDual(int i) retrieve dual value (reduced cost) of auxiliary variable associated with row i
double	iptRowPrim(int i) Retrieve primal value of auxiliary variable of row i
int	iptStatus() Retrieve status of interior-point solution
void	loadMatrix(int ne, int[] ia, int[] ja, double[] ar) Load (replace) the whole constraint matrix
double	mipColVal(int j) Retrieve value of the structural variable associated with column j
double	mipObjVal() Retrieve value of the objective function
double	mipRowVal(int i) Retrieve value of the auxiliary variable associated with row i
int	mipStatus() Retrieve status of MIP solution
int	primRatioTest(int len, int[] ind, double[] val, int how, double tol) Perform primal ratio test
boolean	printIps(java.lang.String fname) Write interior point solution in printable format
boolean	printMip(java.lang.String fname) Write MIP solution in printable format
boolean	printProb(java.lang.String fname) Write problem data in plain text format
boolean	printSensBnds(java.lang.String fname) Write bounds sensitivity information
boolean	printSol(java.lang.String fname) Write basic solution in printable format
boolean	readBas(java.lang.String fname) Read LP basis in fixed MPS format
static GlpkSolver	readCpxlp(java.lang.String fname) Read problem data in CPLEX LP format Example: GlpkSolver solver = solver.readFreemps("plan.lp");
static GlpkSolver	readFreemps(java.lang.String fname) Read problem data in free MPS format
static GlpkSolver	readModel(java.lang.String model, java.lang.String data, java.lang.String output) Read model written in GNU MathProg modeling language
static GlpkSolver	readMps(java.lang.String fname) Read problem data in fixed MPS format
void	resetParms() Reset control parameters to default values
void	scaleProb() Scale problem data
void	setClss(int klass) Set (change) problem class
void	setColBnds(int j, int type, double lb, double ub) Set (change) column bounds
void	setColKind(int j, int kind) Set (change) kind of column (structural variable) j
void	setColName(int j, java.lang.String name) Assign (change) column name
void	setColStat(int j, int stat) Set (change) status of column j
void	setHook(GlpkHookIFC hook) Install a callback for handling printing and fault messages
void	setIntParm(int parm, int val) Set (change) integer control parameter
void	setMatCol(int j, int len, int[] ind, double[] val) Set (replace) column j of the constraint matrix
void	setMatRow(int i, int len, int[] ind, double[] val) Set (replace) row i of the constraint matrix
void	setObjCoef(int j, double coef) Set (change) objective coefficient or constant term
void	setObjDir(int dir) Set (change) optimization direction flag.
void	setObjName(java.lang.String name) Assign (change) the name of the objective funtion
void	setProbName(java.lang.String name) Assign (change) LP problem name
void	setRealParm(int parm, double val) Set (change) real control parameter
void	setRowBnds(int i, int type, double lb, double ub) Set (change) row bounds
void	setRowName(int i, java.lang.String name) Assign (change) row name
void	setRowStat(int i, int stat) Set (change) status of row i
int	simplex() Solve LP problem using the simplex method
void	stdBasis() Construct standard initial LP basis
int	transformCol(int len, int[] ind, double[] val) Transform explicitly specified column
int	transformRow(int len, int[] ind, double[] val) Transform explicitly specified row
void	unscaleProb() Unscale problem data
int	warmUp() “Warm up” / refresh LP basis
boolean	writeBas(java.lang.String fname) Write LP basis in fixed MPS format
boolean	writeCpxlp(java.lang.String fname) Write problem data in CPLEX LP format
boolean	writeFreemps(java.lang.String fname) Write problem data in free MPS format
boolean	writeMps(java.lang.String fname) Write problem data in fixed MPS format

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LPX_LP

public static final int LPX_LP

See Also:

Constant Field Values

LPX_MIP

public static final int LPX_MIP

See Also:

Constant Field Values

LPX_FR

public static final int LPX_FR

See Also:

Constant Field Values

LPX_LO

public static final int LPX_LO

See Also:

Constant Field Values

LPX_UP

public static final int LPX_UP

See Also:

Constant Field Values

LPX_DB

public static final int LPX_DB

See Also:

Constant Field Values

LPX_FX

public static final int LPX_FX

See Also:

Constant Field Values

LPX_MIN

public static final int LPX_MIN

See Also:

Constant Field Values

LPX_MAX

public static final int LPX_MAX

See Also:

Constant Field Values

LPX_B_UNDEF

public static final int LPX_B_UNDEF

See Also:

Constant Field Values

LPX_B_VALID

public static final int LPX_B_VALID

See Also:

Constant Field Values

LPX_P_UNDEF

public static final int LPX_P_UNDEF

See Also:

Constant Field Values

LPX_P_FEAS

public static final int LPX_P_FEAS

See Also:

Constant Field Values

LPX_P_INFEAS

public static final int LPX_P_INFEAS

See Also:

Constant Field Values

LPX_P_NOFEAS

public static final int LPX_P_NOFEAS

See Also:

Constant Field Values

LPX_D_UNDEF

public static final int LPX_D_UNDEF

See Also:

Constant Field Values

LPX_D_FEAS

public static final int LPX_D_FEAS

See Also:

Constant Field Values

LPX_D_INFEAS

public static final int LPX_D_INFEAS

See Also:

Constant Field Values

LPX_D_NOFEAS

public static final int LPX_D_NOFEAS

See Also:

Constant Field Values

LPX_BS

public static final int LPX_BS

See Also:

Constant Field Values

LPX_NL

public static final int LPX_NL

See Also:

Constant Field Values

LPX_NU

public static final int LPX_NU

See Also:

Constant Field Values

LPX_NF

public static final int LPX_NF

See Also:

Constant Field Values

LPX_NS

public static final int LPX_NS

See Also:

Constant Field Values

LPX_T_UNDEF

public static final int LPX_T_UNDEF

See Also:

Constant Field Values

LPX_T_OPT

public static final int LPX_T_OPT

See Also:

Constant Field Values

LPX_CV

public static final int LPX_CV

See Also:

Constant Field Values

LPX_IV

public static final int LPX_IV

See Also:

Constant Field Values

LPX_I_UNDEF

public static final int LPX_I_UNDEF

See Also:

Constant Field Values

LPX_I_OPT

public static final int LPX_I_OPT

See Also:

Constant Field Values

LPX_I_FEAS

public static final int LPX_I_FEAS

See Also:

Constant Field Values

LPX_I_NOFEAS

public static final int LPX_I_NOFEAS

See Also:

Constant Field Values

LPX_OPT

public static final int LPX_OPT

See Also:

Constant Field Values

LPX_FEAS

public static final int LPX_FEAS

See Also:

Constant Field Values

LPX_INFEAS

public static final int LPX_INFEAS

See Also:

Constant Field Values

LPX_NOFEAS

public static final int LPX_NOFEAS

See Also:

Constant Field Values

LPX_UNBND

public static final int LPX_UNBND

See Also:

Constant Field Values

LPX_UNDEF

public static final int LPX_UNDEF

See Also:

Constant Field Values

LPX_E_OK

public static final int LPX_E_OK

See Also:

Constant Field Values

LPX_E_EMPTY

public static final int LPX_E_EMPTY

See Also:

Constant Field Values

LPX_E_BADB

public static final int LPX_E_BADB

See Also:

Constant Field Values

LPX_E_INFEAS

public static final int LPX_E_INFEAS

See Also:

Constant Field Values

LPX_E_FAULT

public static final int LPX_E_FAULT

See Also:

Constant Field Values

LPX_E_OBJLL

public static final int LPX_E_OBJLL

See Also:

Constant Field Values

LPX_E_OBJUL

public static final int LPX_E_OBJUL

See Also:

Constant Field Values

LPX_E_ITLIM

public static final int LPX_E_ITLIM

See Also:

Constant Field Values

LPX_E_TMLIM

public static final int LPX_E_TMLIM

See Also:

Constant Field Values

LPX_E_NOFEAS

public static final int LPX_E_NOFEAS

See Also:

Constant Field Values

LPX_E_INSTAB

public static final int LPX_E_INSTAB

See Also:

Constant Field Values

LPX_E_SING

public static final int LPX_E_SING

See Also:

Constant Field Values

LPX_E_NOCONV

public static final int LPX_E_NOCONV

See Also:

Constant Field Values

LPX_E_NOPFS

public static final int LPX_E_NOPFS

See Also:

Constant Field Values

LPX_E_NODFS

public static final int LPX_E_NODFS

See Also:

Constant Field Values

LPX_K_MSGLEV

public static final int LPX_K_MSGLEV

See Also:

Constant Field Values

LPX_K_SCALE

public static final int LPX_K_SCALE

See Also:

Constant Field Values

LPX_K_DUAL

public static final int LPX_K_DUAL

See Also:

Constant Field Values

LPX_K_PRICE

public static final int LPX_K_PRICE

See Also:

Constant Field Values

LPX_K_RELAX

public static final int LPX_K_RELAX

See Also:

Constant Field Values

LPX_K_TOLBND

public static final int LPX_K_TOLBND

See Also:

Constant Field Values

LPX_K_TOLDJ

public static final int LPX_K_TOLDJ

See Also:

Constant Field Values

LPX_K_TOLPIV

public static final int LPX_K_TOLPIV

See Also:

Constant Field Values

LPX_K_ROUND

public static final int LPX_K_ROUND

See Also:

Constant Field Values

LPX_K_OBJLL

public static final int LPX_K_OBJLL

See Also:

Constant Field Values

LPX_K_OBJUL

public static final int LPX_K_OBJUL

See Also:

Constant Field Values

LPX_K_ITLIM

public static final int LPX_K_ITLIM

See Also:

Constant Field Values

LPX_K_ITCNT

public static final int LPX_K_ITCNT

See Also:

Constant Field Values

LPX_K_TMLIM

public static final int LPX_K_TMLIM

See Also:

Constant Field Values

LPX_K_OUTFRQ

public static final int LPX_K_OUTFRQ

See Also:

Constant Field Values

LPX_K_OUTDLY

public static final int LPX_K_OUTDLY

See Also:

Constant Field Values

LPX_K_BRANCH

public static final int LPX_K_BRANCH

See Also:

Constant Field Values

LPX_K_BTRACK

public static final int LPX_K_BTRACK

See Also:

Constant Field Values

LPX_K_TOLINT

public static final int LPX_K_TOLINT

See Also:

Constant Field Values

LPX_K_TOLOBJ

public static final int LPX_K_TOLOBJ

See Also:

Constant Field Values

LPX_K_MPSINFO

public static final int LPX_K_MPSINFO

See Also:

Constant Field Values

LPX_K_MPSOBJ

public static final int LPX_K_MPSOBJ

See Also:

Constant Field Values

LPX_K_MPSORIG

public static final int LPX_K_MPSORIG

See Also:

Constant Field Values

LPX_K_MPSWIDE

public static final int LPX_K_MPSWIDE

See Also:

Constant Field Values

LPX_K_MPSFREE

public static final int LPX_K_MPSFREE

See Also:

Constant Field Values

LPX_K_MPSSKIP

public static final int LPX_K_MPSSKIP

See Also:

Constant Field Values

LPX_K_LPTORIG

public static final int LPX_K_LPTORIG

See Also:

Constant Field Values

LPX_K_PRESOL

public static final int LPX_K_PRESOL

See Also:

Constant Field Values

Constructor Detail

GlpkSolver

public GlpkSolver()

Method Detail

finalize

protected void finalize()

Overrides:

finalize in class java.lang.Object

enablePrints

public void enablePrints(boolean enable)

setHook

public void setHook(GlpkHookIFC hook)

Install a callback for handling printing and fault messages

setProbName

public void setProbName(java.lang.String name)

Assign (change) LP problem name

setObjName

public void setObjName(java.lang.String name)

Assign (change) the name of the objective funtion

setObjDir

public void setObjDir(int dir)

Set (change) optimization direction flag.
Maximize: dir = GlpkSolver.LPX_MAX;
Minimize: dir = GlpkSolver.LPX_MIN;

addRows

public void addRows(int nrs)

Add nrs new rows (constraints) to problem object

addCols

public void addCols(int ncs)

Add new ncs columns (structural variables) to problem object

setRowName

public void setRowName(int i,
                       java.lang.String name)

Assign (change) row name

setColName

public void setColName(int j,
                       java.lang.String name)

Assign (change) column name

setRowBnds

public void setRowBnds(int i,
                       int type,
                       double lb,
                       double ub)

Set (change) row bounds

setColBnds

public void setColBnds(int j,
                       int type,
                       double lb,
                       double ub)

Set (change) column bounds

setObjCoef

public void setObjCoef(int j,
                       double coef)

Set (change) objective coefficient or constant term

setMatRow

public void setMatRow(int i,
                      int len,
                      int[] ind,
                      double[] val)

Set (replace) row i of the constraint matrix

Parameters:

len - length of new row

ind - indices of columns

val - corresponding values (no zeros allowed)

setMatCol

public void setMatCol(int j,
                      int len,
                      int[] ind,
                      double[] val)

Set (replace) column j of the constraint matrix

Parameters:

len - length of new column

ind - indices of rows

val - corresponding values (no zeros allowed)

loadMatrix

public void loadMatrix(int ne,
                       int[] ia,
                       int[] ja,
                       double[] ar)

Load (replace) the whole constraint matrix

Parameters:

ne - number of elements in matrix

ia - row counter

ja - column counter

ar - value of matrix element (no zeros allowed)

delRows

public void delRows(int nrs,
                    int[] num)

Delete nrs rows from problem object

Parameters:

num - contains ordinal row numbers

delCols

public void delCols(int ncs,
                    int[] num)

Delete ncs columns from problem object

Parameters:

num - contains ordinal column numbers

getProbName

public java.lang.String getProbName()

Retrieve problem name

getObjName

public java.lang.String getObjName()

Retrieve objective function name

getObjDir

public int getObjDir()

Retrieve optimization direction flag

getNumRows

public int getNumRows()

Retrieve number of rows

getNumCols

public int getNumCols()

Retrieve number of columns

getRowName

public java.lang.String getRowName(int i)

Retrieve name of row i

getColName

public java.lang.String getColName(int j)

Retrieve name of column j

getRowType

public int getRowType(int i)

Retrieve type of row i

getRowLb

public double getRowLb(int i)

Retrieve lower bound of row i

getRowUb

public double getRowUb(int i)

Retrieve upper bound of row i

getColType

public int getColType(int j)

Retrieve type of column j

getColLb

public double getColLb(int j)

Retrieve lower bound of column j

getColUb

public double getColUb(int j)

Retrieve upper bound of column j

getObjCoef

public double getObjCoef(int j)

Retrieve objective function coefficient or constant term

getNumNz

public int getNumNz()

Retrieve number of constraint coefficients (non-zero elements in constraint matrix)

getMatRow

public int getMatRow(int i,
                     int[] ind,
                     double[] val)

Retrieve row i of the constraint matrix.

Parameters:

ind - contains column indices

val - contains the corresponding values

getMatCol

public int getMatCol(int j,
                     int[] ind,
                     double[] val)

Retrieve column j of the constraint matrix.

Parameters:

ind - contains column indices

val - contains the corresponding values

scaleProb

public void scaleProb()

Scale problem data

unscaleProb

public void unscaleProb()

Unscale problem data

stdBasis

public void stdBasis()

Construct standard initial LP basis

advBasis

public void advBasis()

Construct advanced initial LP basis

setRowStat

public void setRowStat(int i,
                       int stat)

Set (change) status of row i

setColStat

public void setColStat(int j,
                       int stat)

Set (change) status of column j

simplex

public int simplex()

Solve LP problem using the simplex method

getStatus

public int getStatus()

Retrieve generic status of the basic solution

getPrimStat

public int getPrimStat()

Retrieve primal status of the basic solution

getDualStat

public int getDualStat()

Retrieve dual status of the basic solution

getObjVal

public double getObjVal()

Retrieve current value of the objective function

getRowStat

public int getRowStat(int i)

Retrieve status of row i

getRowPrim

public double getRowPrim(int i)

Retrieve primal value of auxiliary variable of row i

getRowDual

public double getRowDual(int i)

Retrieve dual value (reduced cost) of auxiliary variable associated with row i

getColStat

public int getColStat(int j)

Retrieve status of column j

getColPrim

public double getColPrim(int j)

Retrieve primal value of the structural variable (column) j

getColDual

public double getColDual(int j)

Retrieve dual value (reduced cost) of the structural variable (column) j

getRayInfo

public int getRayInfo()

Retrieve non-basic variable which causes unboundness

checkKkt

public void checkKkt(int scaled,
                     GlpkSolverKktConditions kkt)

Check Karush-Kuhn-Tucker conditions

warmUp

public int warmUp()

“Warm up” / refresh LP basis

evalTabRow

public int evalTabRow(int k,
                      int[] ind,
                      double[] val)

Compute row of the simplex table

evalTabCol

public int evalTabCol(int k,
                      int[] ind,
                      double[] val)

Compute column of the simplex table

transformRow

public int transformRow(int len,
                        int[] ind,
                        double[] val)

Transform explicitly specified row

transformCol

public int transformCol(int len,
                        int[] ind,
                        double[] val)

Transform explicitly specified column

primRatioTest

public int primRatioTest(int len,
                         int[] ind,
                         double[] val,
                         int how,
                         double tol)

Perform primal ratio test

dualRatioTest

public int dualRatioTest(int len,
                         int[] ind,
                         double[] val,
                         int how,
                         double tol)

Perform dual ratio test

interior

public int interior()

Solve LP problem using the primal-dual interior point method

iptStatus

public int iptStatus()

Retrieve status of interior-point solution

iptObjVal

public double iptObjVal()

Retrieve objective value from interior-point solution

iptRowPrim

public double iptRowPrim(int i)

Retrieve primal value of auxiliary variable of row i

iptRowDual

public double iptRowDual(int i)

retrieve dual value (reduced cost) of auxiliary variable associated with row i

iptColPrim

public double iptColPrim(int j)

Retrieve primal value of structural variable of column j

iptColDual

public double iptColDual(int j)

Retrieve dual value (reduced cost) of auxiliary variable associated with column j

setClss

public void setClss(int klass)

Set (change) problem class

Parameters:

klass - LPX_LP: LP problem, LPX_MIP: MIP problem

getClss

public int getClss()

Retrieve problem class

setColKind

public void setColKind(int j,
                       int kind)

Set (change) kind of column (structural variable) j

Parameters:

kind - LPX_CV: continuous, LPX_IV: integer

getColKind

public int getColKind(int j)

Retrieve kind of column j

getNumInt

public int getNumInt()

Retrieve number of integer columns

getNumBin

public int getNumBin()

Retrieve number of binary columns

integer

public int integer()

Solve MIP problem using the branch-and-bound method

mipStatus

public int mipStatus()

Retrieve status of MIP solution

mipObjVal

public double mipObjVal()

Retrieve value of the objective function

mipRowVal

public double mipRowVal(int i)

Retrieve value of the auxiliary variable associated with row i

mipColVal

public double mipColVal(int j)

Retrieve value of the structural variable associated with column j

resetParms

public void resetParms()

Reset control parameters to default values

setIntParm

public void setIntParm(int parm,
                       int val)

Set (change) integer control parameter

getIntParm

public int getIntParm(int parm)

Query integer control parameter

setRealParm

public void setRealParm(int parm,
                        double val)

Set (change) real control parameter

getRealParm

public double getRealParm(int parm)

Query real control parameter

readMps

public static GlpkSolver readMps(java.lang.String fname)

Read problem data in fixed MPS format

writeMps

public boolean writeMps(java.lang.String fname)

Write problem data in fixed MPS format

readBas

public boolean readBas(java.lang.String fname)

Read LP basis in fixed MPS format

writeBas

public boolean writeBas(java.lang.String fname)

Write LP basis in fixed MPS format

readFreemps

public static GlpkSolver readFreemps(java.lang.String fname)

Read problem data in free MPS format

writeFreemps

public boolean writeFreemps(java.lang.String fname)

Write problem data in free MPS format

readCpxlp

public static GlpkSolver readCpxlp(java.lang.String fname)

Read problem data in CPLEX LP format Example: GlpkSolver solver = solver.readFreemps("plan.lp");

writeCpxlp

public boolean writeCpxlp(java.lang.String fname)

Write problem data in CPLEX LP format

readModel

public static GlpkSolver readModel(java.lang.String model,
                                   java.lang.String data,
                                   java.lang.String output)

Read model written in GNU MathProg modeling language

printProb

public boolean printProb(java.lang.String fname)

Write problem data in plain text format

printSol

public boolean printSol(java.lang.String fname)

Write basic solution in printable format

printSensBnds

public boolean printSensBnds(java.lang.String fname)

Write bounds sensitivity information

printIps

public boolean printIps(java.lang.String fname)

Write interior point solution in printable format

printMip

public boolean printMip(java.lang.String fname)

Write MIP solution in printable format