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int PLASMA_zcgels_Tile |
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PLASMA_enum |
trans, |
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PLASMA_desc * |
A, |
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PLASMA_desc * |
T, |
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PLASMA_desc * |
B, |
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PLASMA_desc * |
X, |
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int * |
ITER | |
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) |
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PLASMA_zcgels_Tile - Solves overdetermined or underdetermined linear system of equations using the tile QR or the tile LQ factorization and mixed-precision iterative refinement. Tile equivalent of PLASMA_zcgesv(). Operates on matrices stored by tiles. All matrices are passed through descriptors. All dimensions are taken from the descriptors.
- Parameters:
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[in] | trans | Intended usage: = PlasmaNoTrans: the linear system involves A; = PlasmaConjTrans: the linear system involves A**H. Currently only PlasmaNoTrans is supported. |
[in,out] | A |
- If the iterative refinement converged, A is not modified;
- otherwise, it fell back to double precision solution, and on exit the M-by-N matrix A contains: if M >= N, A is overwritten by details of its QR factorization as returned by PLASMA_zgeqrf; if M < N, A is overwritten by details of its LQ factorization as returned by PLASMA_zgelqf.
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[out] | T | On exit:
- if the iterative refinement converged, T is not modified;
- otherwise, it fell back to double precision solution, and then T is an auxiliary factorization data.
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[in,out] | B | On entry, the M-by-NRHS matrix B of right hand side vectors, stored columnwise; On exit, if return value = 0, B is overwritten by the solution vectors, stored columnwise: if M >= N, rows 1 to N of B contain the least squares solution vectors; the residual sum of squares for the solution in each column is given by the sum of squares of the modulus of elements N+1 to M in that column; if M < N, rows 1 to N of B contain the minimum norm solution vectors; |
- Returns:
- Return values:
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| PLASMA_SUCCESS | successful exit |
- See also:
- PLASMA_zcgels
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PLASMA_zcgels_Tile_Async
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PLASMA_dsgels_Tile
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PLASMA_zgels_Tile
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