NAG Library Manual, Mark 27.2
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nag_sparse_real_rect_sort (f11zcc) Example Program Results

Elements of B
NNZ =    7
B    BROW    BCOL
0      4.0000e+00       3       1
1      1.0000e+00       1       2
2     -1.0000e+00       2       4
3      0.0000e+00       1       4
4      2.0000e+00       1       1
5      1.0000e+00       2       3
6      1.0000e+00       3       3

Elements of C
NNZ =    5
C    CROW    CCOL
0      2.0000e+00       3       4
1      4.0000e+00       1       1
2      2.0000e+00       1       3
3     -1.0000e+00       2       2
4      1.0000e+00       2       4

Summed and reordered elements of A = B + C, along columns first
NNZ =    8
A    IROW    ICOL
0      6.0000e+00       1       1
1      4.0000e+00       3       1
2      1.0000e+00       1       2
3     -1.0000e+00       2       2
4      2.0000e+00       1       3
5      1.0000e+00       2       3
6      1.0000e+00       3       3
7      2.0000e+00       3       4

Same matrix in CCS format
NNZ =    8
A    IROW    ISTC
0      6.0000e+00       1       1
1      4.0000e+00       3       3
2      1.0000e+00       1       5
3     -1.0000e+00       2       8
4      2.0000e+00       1       9
5      1.0000e+00       2
6      1.0000e+00       3
7      2.0000e+00       3

Same matrix with some rows put out of order
NNZ =    8
A    IROW    ISTC
0      4.0000e+00       3       1
1      6.0000e+00       1       3
2      1.0000e+00       1       5
3     -1.0000e+00       2       8
4      1.0000e+00       3       9
5      1.0000e+00       2
6      2.0000e+00       1
7      2.0000e+00       3

Rows reordered and matrix converted from CCS to CS format
NNZ =    8
A    IROW    ICOL
0      6.0000e+00       1       1
1      4.0000e+00       3       1
2      1.0000e+00       1       2
3     -1.0000e+00       2       2
4      2.0000e+00       1       3
5      1.0000e+00       2       3
6      1.0000e+00       3       3
7      2.0000e+00       3       4

Transpose of this matrix passed to get row-major order
NNZ =    8
A    IROW    ICOL
0      6.0000e+00       1       1
1      1.0000e+00       1       2
2      2.0000e+00       1       3
3     -1.0000e+00       2       2
4      1.0000e+00       2       3
5      4.0000e+00       3       1
6      1.0000e+00       3       3
7      2.0000e+00       3       4

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