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| template<typename Index > |
| static Index | clear_mark (Index n_row, Colamd_Row< Index > Row[]) |
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| template<typename Index > |
| static bool | colamd (Index n_row, Index n_col, Index Alen, Index *A, Index *p, double knobs[COLAMD_KNOBS], Index stats[COLAMD_STATS]) |
| | Computes a column ordering using the column approximate minimum degree ordering. More...
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| template<typename Index > |
| Index | colamd_c (Index n_col) |
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| template<typename Index > |
| Index | colamd_r (Index n_row) |
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| template<typename Index > |
| Index | colamd_recommended (Index nnz, Index n_row, Index n_col) |
| | Returns the recommended value of Alen. More...
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| static void | colamd_set_defaults (double knobs[COLAMD_KNOBS]) |
| | set default parameters The use of this routine is optional. More...
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| template<typename Index > |
| static void | detect_super_cols (colamd_col< Index > Col[], Index A[], Index head[], Index row_start, Index row_length) |
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| template<typename Index > |
| static Index | find_ordering (Index n_row, Index n_col, Index Alen, Colamd_Row< Index > Row[], colamd_col< Index > Col[], Index A[], Index head[], Index n_col2, Index max_deg, Index pfree) |
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| template<typename Index > |
| static Index | garbage_collection (Index n_row, Index n_col, Colamd_Row< Index > Row[], colamd_col< Index > Col[], Index A[], Index *pfree) |
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| template<typename Index > |
| static Index | init_rows_cols (Index n_row, Index n_col, Colamd_Row< Index > Row[], colamd_col< Index > col[], Index A[], Index p[], Index stats[COLAMD_STATS]) |
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| template<typename Index > |
| static void | init_scoring (Index n_row, Index n_col, Colamd_Row< Index > Row[], colamd_col< Index > Col[], Index A[], Index head[], double knobs[COLAMD_KNOBS], Index *p_n_row2, Index *p_n_col2, Index *p_max_deg) |
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| template<typename Index > |
| static void | order_children (Index n_col, colamd_col< Index > Col[], Index p[]) |
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template<typename Index >
| static bool internal::colamd |
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Index |
n_row, |
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Index |
n_col, |
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Index |
Alen, |
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Index * |
A, |
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Index * |
p, |
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double |
knobs[COLAMD_KNOBS], |
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Index |
stats[COLAMD_STATS] |
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) |
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static |
Computes a column ordering using the column approximate minimum degree ordering.
Computes a column ordering (Q) of A such that P(AQ)=LU or (AQ)'AQ=LL' have less fill-in and require fewer floating point operations than factorizing the unpermuted matrix A or A'A, respectively.
- Parameters
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| n_row | number of rows in A |
| n_col | number of columns in A |
| Alen,size | of the array A |
| A | row indices of the matrix, of size ALen |
| p | column pointers of A, of size n_col+1 |
| knobs | parameter settings for colamd |
| stats | colamd output statistics and error codes |
Definition at line 329 of file Eigen_Colamd.h.
template<typename Index >
| Index internal::colamd_recommended |
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Index |
nnz, |
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Index |
n_row, |
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Index |
n_col |
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) |
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inline |
Returns the recommended value of Alen.
Returns recommended value of Alen for use by colamd. Returns -1 if any input argument is negative. The use of this routine or macro is optional. Note that the macro uses its arguments more than once, so be careful for side effects, if you pass expressions as arguments to COLAMD_RECOMMENDED.
- Parameters
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| nnz | nonzeros in A |
| n_row | number of rows in A |
| n_col | number of columns in A |
- Returns
- recommended value of Alen for use by colamd
Definition at line 264 of file Eigen_Colamd.h.
| static void internal::colamd_set_defaults |
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double |
knobs[COLAMD_KNOBS] | ) |
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inlinestatic |
set default parameters The use of this routine is optional.
Colamd: rows with more than (knobs [COLAMD_DENSE_ROW] * n_col) entries are removed prior to ordering. Columns with more than (knobs [COLAMD_DENSE_COL] * n_row) entries are removed prior to ordering, and placed last in the output column ordering.
COLAMD_DENSE_ROW and COLAMD_DENSE_COL are defined as 0 and 1, respectively, in colamd.h. Default values of these two knobs are both 0.5. Currently, only knobs [0] and knobs [1] are used, but future versions may use more knobs. If so, they will be properly set to their defaults by the future version of colamd_set_defaults, so that the code that calls colamd will not need to change, assuming that you either use colamd_set_defaults, or pass a (double *) NULL pointer as the knobs array to colamd or symamd.
- Parameters
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| knobs | parameter settings for colamd |
Definition at line 293 of file Eigen_Colamd.h.