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1 /* ========================================================================== */ |
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2 /* === umfpack_get_lunz ===================================================== */ |
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3 /* ========================================================================== */ |
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4 |
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5 /* -------------------------------------------------------------------------- */ |
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6 /* UMFPACK Version 4.4, Copyright (c) 2005 by Timothy A. Davis. CISE Dept, */ |
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7 /* Univ. of Florida. All Rights Reserved. See ../Doc/License for License. */ |
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8 /* web: http://www.cise.ufl.edu/research/sparse/umfpack */ |
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9 /* -------------------------------------------------------------------------- */ |
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10 |
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11 int umfpack_di_get_lunz |
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12 ( |
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13 int *lnz, |
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14 int *unz, |
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15 int *n_row, |
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16 int *n_col, |
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17 int *nz_udiag, |
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18 void *Numeric |
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19 ) ; |
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20 |
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21 long umfpack_dl_get_lunz |
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22 ( |
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23 long *lnz, |
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24 long *unz, |
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25 long *n_row, |
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26 long *n_col, |
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27 long *nz_udiag, |
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28 void *Numeric |
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29 ) ; |
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30 |
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31 int umfpack_zi_get_lunz |
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32 ( |
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33 int *lnz, |
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34 int *unz, |
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35 int *n_row, |
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36 int *n_col, |
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37 int *nz_udiag, |
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38 void *Numeric |
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39 ) ; |
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40 |
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41 long umfpack_zl_get_lunz |
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42 ( |
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43 long *lnz, |
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44 long *unz, |
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45 long *n_row, |
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46 long *n_col, |
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47 long *nz_udiag, |
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48 void *Numeric |
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49 ) ; |
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50 |
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51 /* |
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52 double int Syntax: |
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53 |
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54 #include "umfpack.h" |
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55 void *Numeric ; |
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56 int status, lnz, unz, n_row, n_col ; |
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57 status = umfpack_di_get_lunz (&lnz, &unz, &n_row, &n_col, Numeric) ; |
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58 |
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59 double long Syntax: |
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60 |
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61 #include "umfpack.h" |
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62 void *Numeric ; |
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63 long status, lnz, unz, n_row, n_col ; |
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64 status = umfpack_dl_get_lunz (&lnz, &unz, &n_row, &n_col, Numeric) ; |
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65 |
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66 complex int Syntax: |
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67 |
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68 #include "umfpack.h" |
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69 void *Numeric ; |
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70 int status, lnz, unz, n_row, n_col ; |
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71 status = umfpack_zi_get_lunz (&lnz, &unz, &n_row, &n_col, Numeric) ; |
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72 |
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73 complex long Syntax: |
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74 |
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75 #include "umfpack.h" |
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76 void *Numeric ; |
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77 long status, lnz, unz, n_row, n_col ; |
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78 status = umfpack_zl_get_lunz (&lnz, &unz, &n_row, &n_col, Numeric) ; |
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79 |
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80 Purpose: |
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81 |
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82 Determines the size and number of nonzeros in the LU factors held by the |
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83 Numeric object. These are also the sizes of the output arrays required |
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84 by umfpack_*_get_numeric. |
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85 |
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86 The matrix L is n_row -by- min(n_row,n_col), with lnz nonzeros, including |
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87 the entries on the unit diagonal of L. |
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88 |
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89 The matrix U is min(n_row,n_col) -by- n_col, with unz nonzeros, including |
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90 nonzeros on the diagonal of U. |
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91 |
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92 Returns: |
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93 |
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94 UMFPACK_OK if successful. |
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95 UMFPACK_ERROR_invalid_Numeric_object if Numeric is not a valid object. |
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96 UMFPACK_ERROR_argument_missing if any other argument is (Int *) NULL. |
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97 |
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98 Arguments: |
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99 |
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100 Int *lnz ; Output argument. |
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101 |
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102 The number of nonzeros in L, including the diagonal (which is all |
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103 one's). This value is the required size of the Lj and Lx arrays as |
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104 computed by umfpack_*_get_numeric. The value of lnz is identical to |
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105 Info [UMFPACK_LNZ], if that value was returned by umfpack_*_numeric. |
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106 |
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107 Int *unz ; Output argument. |
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108 |
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109 The number of nonzeros in U, including the diagonal. This value is the |
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110 required size of the Ui and Ux arrays as computed by |
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111 umfpack_*_get_numeric. The value of unz is identical to |
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112 Info [UMFPACK_UNZ], if that value was returned by umfpack_*_numeric. |
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113 |
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114 Int *n_row ; Output argument. |
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115 Int *n_col ; Output argument. |
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116 |
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117 The order of the L and U matrices. L is n_row -by- min(n_row,n_col) |
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118 and U is min(n_row,n_col) -by- n_col. |
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119 |
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120 Int *nz_udiag ; Output argument. |
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121 |
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122 The number of numerically nonzero values on the diagonal of U. The |
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123 matrix is singular if nz_diag < min(n_row,n_col). A divide-by-zero |
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124 will occur if nz_diag < n_row == n_col when solving a sparse system |
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125 involving the matrix U in umfpack_*_*solve. The value of nz_udiag is |
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126 identical to Info [UMFPACK_UDIAG_NZ] if that value was returned by |
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127 umfpack_*_numeric. |
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128 |
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129 void *Numeric ; Input argument, not modified. |
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130 |
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131 Numeric must point to a valid Numeric object, computed by |
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132 umfpack_*_numeric. |
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133 */ |
