nlpi_ipopt_dummy.c File Reference

Detailed Description

dummy Ipopt NLP interface for the case that Ipopt is not available

Author

Stefan Vigerske

Benjamin Müller

This code has been separate from nlpi_ipopt.cpp, so the SCIP build system recognizes it as pure C code, thus the linker does not need to be changed to C++.

Definition in file nlpi_ipopt_dummy.c.

#include "scip/pub_message.h"
#include "nlpi/nlpi_ipopt.h"

Go to the source code of this file.

Functions
SCIP_RETCODE	SCIPcreateNlpSolverIpopt (BMS_BLKMEM *blkmem, SCIP_NLPI **nlpi)
const char *	SCIPgetSolverNameIpopt (void)
const char *	SCIPgetSolverDescIpopt (void)
SCIP_Bool	SCIPisIpoptAvailableIpopt (void)
void *	SCIPgetIpoptApplicationPointerIpopt (SCIP_NLPIPROBLEM *nlpiproblem)
void *	SCIPgetNlpiOracleIpopt (SCIP_NLPIPROBLEM *nlpiproblem)
void	SCIPsetModifiedDefaultSettingsIpopt (SCIP_NLPI *nlpi, const char *optionsstring)
SCIP_RETCODE	LapackDsyev (SCIP_Bool computeeigenvectors, int N, SCIP_Real *a, SCIP_Real *w)
SCIP_RETCODE	SCIPsolveLinearProb (int N, SCIP_Real **a, SCIP_Real *b, SCIP_Real *x, SCIP_Bool *success)

Function Documentation

SCIP_RETCODE SCIPcreateNlpSolverIpopt	(	BMS_BLKMEM *	blkmem,
		SCIP_NLPI **	nlpi
	)

create solver interface for Ipopt solver

Parameters

blkmem	block memory data structure
nlpi	pointer to buffer for nlpi address

Definition at line 31 of file nlpi_ipopt_dummy.c.

References NLPI_DESC, NLPI_NAME, NLPI_PRIORITY, NULL, SCIP_ALLOC, SCIP_CALL, SCIP_OKAY, and SCIPnlpiCreate().

const char* SCIPgetSolverNameIpopt

(

void

)

gets string that identifies Ipopt (version number)

Definition at line 44 of file nlpi_ipopt_dummy.c.

const char* SCIPgetSolverDescIpopt

(

void

)

gets string that describes Ipopt (version number)

Definition at line 50 of file nlpi_ipopt_dummy.c.

SCIP_Bool SCIPisIpoptAvailableIpopt

(

void

)

returns whether Ipopt is available, i.e., whether it has been linked in

Definition at line 56 of file nlpi_ipopt_dummy.c.

References FALSE, and TRUE.

void* SCIPgetIpoptApplicationPointerIpopt

(

SCIP_NLPIPROBLEM *

nlpiproblem

)

gives a pointer to the IpoptApplication object stored in Ipopt-NLPI's NLPI problem data structure

Parameters

nlpiproblem

NLP problem of Ipopt-NLPI

Definition at line 62 of file nlpi_ipopt_dummy.c.

References SCIP_NlpiProblem::ipopt, NULL, SCIPABORT, and SCIPerrorMessage.

void* SCIPgetNlpiOracleIpopt

(

SCIP_NLPIPROBLEM *

nlpiproblem

)

gives a pointer to the NLPIORACLE object stored in Ipopt-NLPI's NLPI problem data structure

Parameters

nlpiproblem

NLP problem of Ipopt-NLPI

Definition at line 72 of file nlpi_ipopt_dummy.c.

References NULL, SCIP_NlpiProblem::oracle, SCIPABORT, and SCIPerrorMessage.

void SCIPsetModifiedDefaultSettingsIpopt	(	SCIP_NLPI *	nlpi,
		const char *	optionsstring
	)

sets modified default settings that are used when setting up an Ipopt problem

Do not forget to add a newline after the last option in optionsstring.

Parameters

nlpi	Ipopt NLP interface
optionsstring	string with options as in Ipopt options file

Definition at line 85 of file nlpi_ipopt_dummy.c.

References NULL, SCIPABORT, SCIPerrorMessage, and SCIPnlpiGetData().

SCIP_RETCODE LapackDsyev	(	SCIP_Bool	computeeigenvectors,
		int	N,
		SCIP_Real *	a,
		SCIP_Real *	w
	)

Calls Lapacks Dsyev routine to compute eigenvalues and eigenvectors of a dense matrix. It's here, because Ipopt is linked against Lapack.

Parameters

computeeigenvectors	should also eigenvectors should be computed ?
N	dimension
a	matrix data on input (size N*N); eigenvectors on output if computeeigenvectors == TRUE
w	buffer to store eigenvalues (size N)

Definition at line 97 of file nlpi_ipopt_dummy.c.

References SCIP_ERROR, SCIP_OKAY, and SCIPerrorMessage.

SCIP_RETCODE SCIPsolveLinearProb	(	int	N,
		SCIP_Real **	a,
		SCIP_Real *	b,
		SCIP_Real *	x,
		SCIP_Bool *	success
	)

Calls Lapacks IpLapackDgetrf routine to calculate a LU factorization and uses this factorization to solve the linear problem Ax = b. It's here, because Ipopt is linked against Lapack.

solves a linear problem of the form Ax = b

Calls Lapacks IpLapackDgetrf routine to calculate a LU factorization and uses this factorization to solve the linear problem Ax = b. It's here, because Ipopt is linked against Lapack.

Parameters

N	dimension
a	matrix data on input (size N*N)
b	right hand side vector (size N)
x	buffer to store solution (size N)
success	pointer to store if the solving routine was successful

Definition at line 109 of file nlpi_ipopt_dummy.c.

References BMSallocMemoryArray, BMSfreeMemoryArray, FALSE, NULL, SCIP_ALLOC, SCIP_OKAY, SCIP_Real, SCIPerrorMessage, and TRUE.