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    SRC/colamd.h
    Go to the documentation of this file.
    00001
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    00055 #ifndef COLAMD_H
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    00056 #define COLAMD_H
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    00057
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    00058 /* ========================================================================== */
    kusano 7d535a 
    00059 /* === Include files ======================================================== */
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    00060 /* ========================================================================== */
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    00061
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    00062 #include <stdlib.h>
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    00063
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    00064 /* ========================================================================== */
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    00065 /* === Knob and statistics definitions ====================================== */
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    00066 /* ========================================================================== */
    kusano 7d535a 
    00067
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    00068 /* size of the knobs [ ] array.  Only knobs [0..1] are currently used. */
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    00069 #define COLAMD_KNOBS 20
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    00070
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    00071 /* number of output statistics.  Only stats [0..6] are currently used. */
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    00072 #define COLAMD_STATS 20
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    00073
    kusano 7d535a 
    00074 /* knobs [0] and stats [0]: dense row knob and output statistic. */
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    00075 #define COLAMD_DENSE_ROW 0
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    00076
    kusano 7d535a 
    00077 /* knobs [1] and stats [1]: dense column knob and output statistic. */
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    00078 #define COLAMD_DENSE_COL 1
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    00079
    kusano 7d535a 
    00080 /* stats [2]: memory defragmentation count output statistic */
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    00081 #define COLAMD_DEFRAG_COUNT 2
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    00082
    kusano 7d535a 
    00083 /* stats [3]: colamd status:  zero OK, > 0 warning or notice, < 0 error */
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    00084 #define COLAMD_STATUS 3
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    00085
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    00086 /* stats [4..6]: error info, or info on jumbled columns */
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    00087 #define COLAMD_INFO1 4
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    00088 #define COLAMD_INFO2 5
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    00089 #define COLAMD_INFO3 6
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    00090
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    00091 /* error codes returned in stats [3]: */
    kusano 7d535a 
    00092 #define COLAMD_OK                               (0)
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    00093 #define COLAMD_OK_BUT_JUMBLED                   (1)
    kusano 7d535a 
    00094 #define COLAMD_ERROR_A_not_present              (-1)
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    00095 #define COLAMD_ERROR_p_not_present              (-2)
    kusano 7d535a 
    00096 #define COLAMD_ERROR_nrow_negative              (-3)
    kusano 7d535a 
    00097 #define COLAMD_ERROR_ncol_negative              (-4)
    kusano 7d535a 
    00098 #define COLAMD_ERROR_nnz_negative               (-5)
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    00099 #define COLAMD_ERROR_p0_nonzero                 (-6)
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    00100 #define COLAMD_ERROR_A_too_small                (-7)
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    00101 #define COLAMD_ERROR_col_length_negative        (-8)
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    00102 #define COLAMD_ERROR_row_index_out_of_bounds    (-9)
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    00103 #define COLAMD_ERROR_out_of_memory              (-10)
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    00104 #define COLAMD_ERROR_internal_error             (-999)
    kusano 7d535a 
    00105
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    00106 /* ========================================================================== */
    kusano 7d535a 
    00107 /* === Row and Column structures ============================================ */
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    00108 /* ========================================================================== */
    kusano 7d535a 
    00109
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    00110 /* User code that makes use of the colamd/symamd routines need not directly */
    kusano 7d535a 
    00111 /* reference these structures.  They are used only for the COLAMD_RECOMMENDED */
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    00112 /* macro. */
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    00113
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    00114 typedef struct Colamd_Col_struct
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    00115 {
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    00116     int start ;         /* index for A of first row in this column, or DEAD */
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    00117                         /* if column is dead */
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    00118     int length ;        /* number of rows in this column */
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    00119     union
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    00120     {
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    00121         int thickness ; /* number of original columns represented by this */
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    00122                         /* col, if the column is alive */
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    00123         int parent ;    /* parent in parent tree super-column structure, if */
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    00124                         /* the column is dead */
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    00125     } shared1 ;
    kusano 7d535a 
    00126     union
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    00127     {
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    00128         int score ;     /* the score used to maintain heap, if col is alive */
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    00129         int order ;     /* pivot ordering of this column, if col is dead */
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    00130     } shared2 ;
    kusano 7d535a 
    00131     union
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    00132     {
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    00133         int headhash ;  /* head of a hash bucket, if col is at the head of */
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    00134                         /* a degree list */
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    00135         int hash ;      /* hash value, if col is not in a degree list */
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    00136         int prev ;      /* previous column in degree list, if col is in a */
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    00137                         /* degree list (but not at the head of a degree list) */
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    00138     } shared3 ;
    kusano 7d535a 
    00139     union
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    00140     {
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    00141         int degree_next ;       /* next column, if col is in a degree list */
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    00142         int hash_next ;         /* next column, if col is in a hash list */
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    00143     } shared4 ;
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    00144
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    00145 } Colamd_Col ;
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    00146
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    00147 typedef struct Colamd_Row_struct
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    00148 {
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    00149     int start ;         /* index for A of first col in this row */
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    00150     int length ;        /* number of principal columns in this row */
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    00151     union
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    00152     {
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    00153         int degree ;    /* number of principal & non-principal columns in row */
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    00154         int p ;         /* used as a row pointer in init_rows_cols () */
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    00155     } shared1 ;
    kusano 7d535a 
    00156     union
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    00157     {
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    00158         int mark ;      /* for computing set differences and marking dead rows*/
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    00159         int first_column ;/* first column in row (used in garbage collection) */
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    00160     } shared2 ;
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    00161
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    00162 } Colamd_Row ;
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    00163
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    00164 /* ========================================================================== */
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    00165 /* === Colamd recommended memory size ======================================= */
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    00166 /* ========================================================================== */
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    00167
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    00168 /*
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    00169     The recommended length Alen of the array A passed to colamd is given by
    kusano 7d535a 
    00170     the COLAMD_RECOMMENDED (nnz, n_row, n_col) macro.  It returns -1 if any
    kusano 7d535a 
    00171     argument is negative.  2*nnz space is required for the row and column
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    00172     indices of the matrix. COLAMD_C (n_col) + COLAMD_R (n_row) space is
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    00173     required for the Col and Row arrays, respectively, which are internal to
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    00174     colamd.  An additional n_col space is the minimal amount of "elbow room",
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    00175     and nnz/5 more space is recommended for run time efficiency.
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    00176
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    00177     This macro is not needed when using symamd.
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    00178
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    00179     Explicit typecast to int added Sept. 23, 2002, COLAMD version 2.2, to avoid
    kusano 7d535a 
    00180     gcc -pedantic warning messages.
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    00181 */
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    00182
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    00183 #define COLAMD_C(n_col) ((int) (((n_col) + 1) * sizeof (Colamd_Col) / sizeof (int)))
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    00184 #define COLAMD_R(n_row) ((int) (((n_row) + 1) * sizeof (Colamd_Row) / sizeof (int)))
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    00185
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    00186 #define COLAMD_RECOMMENDED(nnz, n_row, n_col)                                 \
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    00187 (                                                                             \
    kusano 7d535a 
    00188 ((nnz) < 0 || (n_row) < 0 || (n_col) < 0)                                     \
    kusano 7d535a 
    00189 ?                                                                             \
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    00190     (-1)                                                                      \
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    00191 :                                                                             \
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    00192     (2 * (nnz) + COLAMD_C (n_col) + COLAMD_R (n_row) + (n_col) + ((nnz) / 5)) \
    kusano 7d535a 
    00193 )
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    00194
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    00195 /* ========================================================================== */
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    00196 /* === Prototypes of user-callable routines ================================= */
    kusano 7d535a 
    00197 /* ========================================================================== */
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    00198
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    00199 int colamd_recommended          /* returns recommended value of Alen, */
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    00200                                 /* or (-1) if input arguments are erroneous */
    kusano 7d535a 
    00201 (
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    00202     int nnz,                    /* nonzeros in A */
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    00203     int n_row,                  /* number of rows in A */
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    00204     int n_col                   /* number of columns in A */
    kusano 7d535a 
    00205 ) ;
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    00206
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    00207 void colamd_set_defaults        /* sets default parameters */
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    00208 (                               /* knobs argument is modified on output */
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    00209     double knobs [COLAMD_KNOBS] /* parameter settings for colamd */
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    00210 ) ;
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    00211
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    00212 int colamd                      /* returns (1) if successful, (0) otherwise*/
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    00213 (                               /* A and p arguments are modified on output */
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    00214     int n_row,                  /* number of rows in A */
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    00215     int n_col,                  /* number of columns in A */
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    00216     int Alen,                   /* size of the array A */
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    00217     int A [],                   /* row indices of A, of size Alen */
    kusano 7d535a 
    00218     int p [],                   /* column pointers of A, of size n_col+1 */
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    00219     double knobs [COLAMD_KNOBS],/* parameter settings for colamd */
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    00220     int stats [COLAMD_STATS]    /* colamd output statistics and error codes */
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    00221 ) ;
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    00222
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    00223 int symamd                              /* return (1) if OK, (0) otherwise */
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    00224 (
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    00225     int n,                              /* number of rows and columns of A */
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    00226     int A [],                           /* row indices of A */
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    00227     int p [],                           /* column pointers of A */
    kusano 7d535a 
    00228     int perm [],                        /* output permutation, size n_col+1 */
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    00229     double knobs [COLAMD_KNOBS],        /* parameters (uses defaults if NULL) */
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    00230     int stats [COLAMD_STATS],           /* output statistics and error codes */
    kusano 7d535a 
    00231     void * (*allocate) (size_t, size_t),
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    00232                                         /* pointer to calloc (ANSI C) or */
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    00233                                         /* mxCalloc (for MATLAB mexFunction) */
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    00234     void (*release) (void *)
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    00235                                         /* pointer to free (ANSI C) or */
    kusano 7d535a 
    00236                                         /* mxFree (for MATLAB mexFunction) */
    kusano 7d535a 
    00237 ) ;
    kusano 7d535a 
    00238
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    00239 void colamd_report
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    00240 (
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    00241     int stats [COLAMD_STATS]
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    00242 ) ;
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    00243
    kusano 7d535a 
    00244 void symamd_report
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    00245 (
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    00246     int stats [COLAMD_STATS]
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    00247 ) ;
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    00248
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    00249 #endif /* COLAMD_H */
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    <address style="text-align: right;"><small>Generated on Mon Nov 22 10:23:47 2010 for SuperLU by </small></address>
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    doxygen 1.5.5
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