GRASS GIS 7 Programmer's Manual
7.9.dev(2021)-e5379bbd7
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Functions | |
int | G_math_add_spvector (G_math_spvector **Asp, G_math_spvector *spvector, int row) |
Adds a sparse vector to a sparse matrix at position row. More... | |
G_math_spvector ** | G_math_alloc_spmatrix (int rows) |
Allocate memory for a sparse matrix. More... | |
G_math_spvector * | G_math_alloc_spvector (int cols) |
Allocate memory for a sparse vector. More... | |
void | G_math_free_spvector (G_math_spvector *spvector) |
Release the memory of the sparse vector. More... | |
void | G_math_free_spmatrix (G_math_spvector **Asp, int rows) |
Release the memory of the sparse matrix. More... | |
void | G_math_print_spmatrix (G_math_spvector **Asp, int rows) |
print the sparse matrix Asp to stdout More... | |
double ** | G_math_Asp_to_A (G_math_spvector **Asp, int rows) |
Convert a sparse matrix into a quadratic matrix. More... | |
double ** | G_math_Asp_to_sband_matrix (G_math_spvector **Asp, int rows, int bandwidth) |
Convert a symmetric sparse matrix into a symmetric band matrix. More... | |
G_math_spvector ** | G_math_A_to_Asp (double **A, int rows, double epsilon) |
Convert a quadratic matrix into a sparse matrix. More... | |
G_math_spvector ** | G_math_sband_matrix_to_Asp (double **A, int rows, int bandwidth, double epsilon) |
Convert a symmetric band matrix into a sparse matrix. More... | |
void | G_math_Ax_sparse (G_math_spvector **Asp, double *x, double *y, int rows) |
Compute the matrix - vector product of sparse matrix **Asp and vector x. More... | |
G_math_spvector** G_math_A_to_Asp | ( | double ** | A, |
int | rows, | ||
double | epsilon | ||
) |
Convert a quadratic matrix into a sparse matrix.
This function is multi-threaded with OpenMP. It creates its own parallel OpenMP region.
A | (double **) |
rows | (int) |
epsilon | (double) – non-zero values are greater then epsilon |
Definition at line 253 of file sparse_matrix.c.
int G_math_add_spvector | ( | G_math_spvector ** | Asp, |
G_math_spvector * | spvector, | ||
int | row | ||
) |
Adds a sparse vector to a sparse matrix at position row.
Return 1 for success and -1 for failure
Asp | G_math_spvector ** |
spvector | G_math_spvector * |
row | int |
Definition at line 35 of file sparse_matrix.c.
G_math_spvector** G_math_alloc_spmatrix | ( | int | rows | ) |
Allocate memory for a sparse matrix.
rows | int |
Definition at line 58 of file sparse_matrix.c.
G_math_spvector* G_math_alloc_spvector | ( | int | cols | ) |
Allocate memory for a sparse vector.
cols | int |
Definition at line 76 of file sparse_matrix.c.
References G_math_spvector::cols, G_calloc, G_debug(), G_math_spvector::index, and G_math_spvector::values.
Referenced by N_assemble_les_2d_param(), and N_assemble_les_3d_param().
double** G_math_Asp_to_A | ( | G_math_spvector ** | Asp, |
int | rows | ||
) |
Convert a sparse matrix into a quadratic matrix.
This function is multi-threaded with OpenMP. It creates its own parallel OpenMP region.
Asp | (G_math_spvector **) |
rows | (int) |
Definition at line 179 of file sparse_matrix.c.
double** G_math_Asp_to_sband_matrix | ( | G_math_spvector ** | Asp, |
int | rows, | ||
int | bandwidth | ||
) |
Convert a symmetric sparse matrix into a symmetric band matrix.
Symmetric matrix with bandwidth of 3 5 2 1 0 2 5 2 1 1 2 5 2 0 1 2 5 will be converted into the band matrix 5 2 1 5 2 1 5 2 0 5 0 0
Asp | (G_math_spvector **) |
rows | (int) |
bandwidth | (int) |
Definition at line 221 of file sparse_matrix.c.
void G_math_Ax_sparse | ( | G_math_spvector ** | Asp, |
double * | x, | ||
double * | y, | ||
int | rows | ||
) |
Compute the matrix - vector product of sparse matrix **Asp and vector x.
This function is multi-threaded with OpenMP and can be called within a parallel OpenMP region.
y = A * x
Asp | (G_math_spvector **) |
x | (double) *) |
y | (double * ) |
rows | (int) |
Definition at line 363 of file sparse_matrix.c.
Referenced by N_les_integrate_dirichlet_2d(), and N_les_integrate_dirichlet_3d().
void G_math_free_spmatrix | ( | G_math_spvector ** | Asp, |
int | rows | ||
) |
Release the memory of the sparse matrix.
Asp | G_math_spvector ** |
rows | int |
Definition at line 121 of file sparse_matrix.c.
References G_free(), G_math_free_spvector(), and NULL.
Referenced by N_free_les().
void G_math_free_spvector | ( | G_math_spvector * | spvector | ) |
Release the memory of the sparse vector.
spvector | G_math_spvector * |
Definition at line 98 of file sparse_matrix.c.
References G_free(), G_math_spvector::index, NULL, and G_math_spvector::values.
Referenced by G_math_free_spmatrix().
void G_math_print_spmatrix | ( | G_math_spvector ** | Asp, |
int | rows | ||
) |
print the sparse matrix Asp to stdout
Asp | (G_math_spvector **) |
rows | (int) |
Definition at line 146 of file sparse_matrix.c.
References G_math_spvector::cols.
G_math_spvector** G_math_sband_matrix_to_Asp | ( | double ** | A, |
int | rows, | ||
int | bandwidth, | ||
double | epsilon | ||
) |
Convert a symmetric band matrix into a sparse matrix.
WARNING: This function is experimental, do not use. Only the upper triangle matrix of the band strcuture is copied.
A | (double **) the symmetric band matrix |
rows | (int) |
bandwidth | (int) |
epsilon | (double) – non-zero values are greater then epsilon |
Definition at line 304 of file sparse_matrix.c.