File: gbsplit.c

package info (click to toggle)
suitesparse-graphblas 7.4.0%2Bdfsg-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 67,112 kB
  • sloc: ansic: 1,072,243; cpp: 8,081; sh: 512; makefile: 506; asm: 369; python: 125; awk: 10
file content (142 lines) | stat: -rw-r--r-- 4,885 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
//------------------------------------------------------------------------------
// gbsplit: matrix split
//------------------------------------------------------------------------------

// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

//------------------------------------------------------------------------------

// gbsplit is an interface to GxB_Matrix_split.

// Usage:

// C = gbsplit (A, m, n, desc)

// where C is a 2D cell array of matrices.

#include "gb_interface.h"

#define USAGE "usage: C = GrB.split (A, m, n, desc)"

//------------------------------------------------------------------------------
// gb_get_tilesizes:  get a list of integers
//------------------------------------------------------------------------------

static inline GrB_Index *gb_get_tilesizes (mxArray *mxList, GrB_Index *len)
{
    int64_t n = mxGetNumberOfElements (mxList) ;
    (*len) = (GrB_Index) n ;
    mxClassID class = mxGetClassID (mxList) ;
    GrB_Index *List = mxMalloc (n * sizeof (GrB_Index)) ;
    // use mxGetData (best for Octave, fine for MATLAB)
    if (class == mxINT64_CLASS)
    {
        int64_t *p = (int64_t *) mxGetData (mxList) ;
        memcpy (List, p, n * sizeof (int64_t)) ;
    }
    else if (class == mxUINT64_CLASS)
    {
        uint64_t *p = (uint64_t *) mxGetData (mxList) ;
        memcpy (List, p, n * sizeof (uint64_t)) ;
    }
    else if (class == mxDOUBLE_CLASS)
    {
        double *p = (double *) mxGetData (mxList) ;
        for (int64_t k = 0 ; k < n ; k++)
        {
            List [k] = (GrB_Index) p [k] ;
            CHECK_ERROR ((double) List [k] != p [k],
                "dimensions must be integer") ;
        }
    }
    else
    {
        ERROR ("unsupported type") ;
    }
    return (List) ;
}

//------------------------------------------------------------------------------
// gbsplit mexFunction
//------------------------------------------------------------------------------

void mexFunction
(
    int nargout,
    mxArray *pargout [ ],
    int nargin,
    const mxArray *pargin [ ]
)
{

    //--------------------------------------------------------------------------
    // check inputs
    //--------------------------------------------------------------------------

    gb_usage ((nargin == 3 || nargin == 4) && nargout <= 2, USAGE) ;

    //--------------------------------------------------------------------------
    // find the arguments
    //--------------------------------------------------------------------------

    mxArray *Matrix [6], *String [2], *Cell [2] ;
    base_enum_t base ;
    kind_enum_t kind ;
    GxB_Format_Value fmt ;
    int nmatrices, nstrings, ncells, sparsity ;
    GrB_Descriptor desc ;
    gb_get_mxargs (nargin, pargin, USAGE, Matrix, &nmatrices, String, &nstrings,
        Cell, &ncells, &desc, &base, &kind, &fmt, &sparsity) ;

    CHECK_ERROR (nmatrices != 3 || nstrings > 0 || ncells > 0, USAGE) ;

    //--------------------------------------------------------------------------
    // get the input matrix A, Tile_nrows, and Tile_ncols
    //--------------------------------------------------------------------------

    GrB_Matrix A = gb_get_shallow (Matrix [0]) ;
    GrB_Index m, n ;
    GrB_Index *Tile_nrows = gb_get_tilesizes (Matrix [1], &m) ;
    GrB_Index *Tile_ncols = gb_get_tilesizes (Matrix [2], &n) ;
    GrB_Matrix *Tiles = mxMalloc (m * n * sizeof (GrB_Matrix)) ;

    //--------------------------------------------------------------------------
    // Tiles = split (A)
    //--------------------------------------------------------------------------

    OK (GxB_Matrix_split (Tiles, m, n, Tile_nrows, Tile_ncols, A, desc)) ;

    //--------------------------------------------------------------------------
    // convert the Tiles array to a built-in cell array
    //--------------------------------------------------------------------------

    mxArray *C = mxCreateCellMatrix (m, n) ;
    for (int64_t i = 0 ; i < m ; i++)
    {
        for (int64_t j = 0 ; j < n ; j++)
        {
            // Tiles is in row-major form and C is in column-major form
            mxSetCell (C, i+j*m, gb_export (&Tiles [i*n+j], kind)) ;
        }
    }

    //--------------------------------------------------------------------------
    // free workspace and shallow copies
    //--------------------------------------------------------------------------

    OK (GrB_Matrix_free (&A)) ;
    OK (GrB_Descriptor_free (&desc)) ;
    mxFree (Tiles) ;
    mxFree (Tile_nrows) ;
    mxFree (Tile_ncols) ;

    //--------------------------------------------------------------------------
    // export the output cell array C
    //--------------------------------------------------------------------------

    pargout [0] = C ;
    pargout [1] = mxCreateDoubleScalar (kind) ;
    GB_WRAPUP ;
}