lapack_dsdp.c File Reference

interface methods for eigenvector computation and matrix multiplication using standard LAPACK and BLAS More...

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Macros
#define	BMS_CALL(x)
#define	SCIP_RealTOINT(x)   ((int) (x + 0.5))

Functions
Functions
SCIP_RETCODE	SCIPlapackComputeEigenvectorDecomposition (BMS_BUFMEM *bufmem, int n, SCIP_Real *A, SCIP_Real *eigenvalues, SCIP_Real *eigenvectors)
SCIP_RETCODE	SCIPlapackMatrixVectorMult (int nrows, int ncols, SCIP_Real *matrix, SCIP_Real *vector, SCIP_Real *result)
SCIP_RETCODE	SCIPlapackMatrixMatrixMult (int nrowsA, int ncolsA, SCIP_Real *matrixA, SCIP_Bool transposeA, int nrowsB, int ncolsB, SCIP_Real *matrixB, SCIP_Bool transposeB, SCIP_Real *result)

Detailed Description

interface methods for eigenvector computation and matrix multiplication using standard LAPACK and BLAS

Author

Sonja Mars

Lars Schewe

Tristan Gally

Definition in file lapack_dsdp.c.

Macro Definition Documentation

#define BMS_CALL

(

x

)

Value:

do                                                                                      \
                      {                                                                                       \
                          if( NULL == (x) )                                                                   \
                          {                                                                                   \
                             SCIPerrorMessage("No memory in function call\n");                                \
                             return SCIP_NOMEMORY;                                                            \
                          }                                                                                   \
                      }                                                                                       \
                      while( FALSE )

Checks if a BMSallocMemory-call was successfull, otherwise returns SCIP_NOMEMORY

Definition at line 56 of file lapack_dsdp.c.

Referenced by SCIPlapackComputeEigenvectorDecomposition().

#define SCIP_RealTOINT

(

x

)

((int) (x + 0.5))

transforms a SCIP_Real (that should be integer, but might be off by some numerical error) to an integer by adding an epsilon and rounding down

Definition at line 67 of file lapack_dsdp.c.

Referenced by SCIPlapackComputeEigenvectorDecomposition().

Function Documentation

SCIP_RETCODE SCIPlapackComputeEigenvectorDecomposition	(	BMS_BUFMEM *	bufmem,
		int	n,
		SCIP_Real *	A,
		SCIP_Real *	eigenvalues,
		SCIP_Real *	eigenvectors
	)

computes the eigenvector decomposition of a symmetric matrix using LAPACK

Parameters

bufmem	buffer memory
n	size of matrix
A	matrix for which the decomposition should be computed
eigenvalues	pointer to store eigenvalues (should be length n)
eigenvectors	pointer to store eigenvectors (should be length n*n), eigenvectors are given as rows

Definition at line 219 of file lapack_dsdp.c.

References BMS_CALL, F77_FUNC, and SCIP_RealTOINT.

SCIP_RETCODE SCIPlapackMatrixVectorMult	(	int	nrows,
		int	ncols,
		SCIP_Real *	matrix,
		SCIP_Real *	vector,
		SCIP_Real *	result
	)

performs matrix-vector-multiplication using BLAS

Parameters

nrows	number of rows in matrix
ncols	number of cols in matrix
matrix	the matrix we want to multiply
vector	vector we want to multiply with the matrix
result	pointer to store the resulting vector

Definition at line 321 of file lapack_dsdp.c.

References F77_FUNC.

SCIP_RETCODE SCIPlapackMatrixMatrixMult	(	int	nrowsA,
		int	ncolsA,
		SCIP_Real *	matrixA,
		SCIP_Bool	transposeA,
		int	nrowsB,
		int	ncolsB,
		SCIP_Real *	matrixB,
		SCIP_Bool	transposeB,
		SCIP_Real *	result
	)

performs matrix-matrix-multiplication A*B using BLAS

Parameters

nrowsA	number of rows in matrix A
ncolsA	number of cols in matrix A
matrixA	matrix A given as nrowsA * ncolsA array
transposeA	should matrix A be transposed before multiplication?
nrowsB	number of rows in matrix B
ncolsB	number of cols in matrix B
matrixB	matrix B given as ncolsA * ncolsB array
transposeB	should matrix B be transposed before multiplication?
result	pointer to nrowsA * nrowsB array to store the resulting matrix

Definition at line 359 of file lapack_dsdp.c.

References F77_FUNC.