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- CCCCUUUUNNNNMMMMQQQQLLLL((((3333FFFF)))) CCCCUUUUNNNNMMMMQQQQLLLL((((3333FFFF))))
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- NNNNAAAAMMMMEEEE
- CUNMQL - overwrite the general complex M-by-N matrix C with SIDE = 'L'
- SIDE = 'R' TRANS = 'N'
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE CUNMQL( SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK,
- LWORK, INFO )
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- CHARACTER SIDE, TRANS
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- INTEGER INFO, K, LDA, LDC, LWORK, M, N
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- COMPLEX A( LDA, * ), C( LDC, * ), TAU( * ), WORK( LWORK )
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- CUNMQL overwrites the general complex M-by-N matrix C with TRANS = 'C':
- Q**H * C C * Q**H
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- where Q is a complex unitary matrix defined as the product of k
- elementary reflectors
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- Q = H(k) . . . H(2) H(1)
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- as returned by CGEQLF. Q is of order M if SIDE = 'L' and of order N if
- SIDE = 'R'.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- SIDE (input) CHARACTER*1
- = 'L': apply Q or Q**H from the Left;
- = 'R': apply Q or Q**H from the Right.
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- TRANS (input) CHARACTER*1
- = 'N': No transpose, apply Q;
- = 'C': Transpose, apply Q**H.
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- M (input) INTEGER
- The number of rows of the matrix C. M >= 0.
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- N (input) INTEGER
- The number of columns of the matrix C. N >= 0.
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- K (input) INTEGER
- The number of elementary reflectors whose product defines the
- matrix Q. If SIDE = 'L', M >= K >= 0; if SIDE = 'R', N >= K >=
- 0.
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- A (input) COMPLEX array, dimension (LDA,K)
- The i-th column must contain the vector which defines the
- elementary reflector H(i), for i = 1,2,...,k, as returned by
- CGEQLF in the last k columns of its array argument A. A is
- modified by the routine but restored on exit.
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- PPPPaaaaggggeeee 1111
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- CCCCUUUUNNNNMMMMQQQQLLLL((((3333FFFF)))) CCCCUUUUNNNNMMMMQQQQLLLL((((3333FFFF))))
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- LDA (input) INTEGER
- The leading dimension of the array A. If SIDE = 'L', LDA >=
- max(1,M); if SIDE = 'R', LDA >= max(1,N).
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- TAU (input) COMPLEX array, dimension (K)
- TAU(i) must contain the scalar factor of the elementary reflector
- H(i), as returned by CGEQLF.
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- C (input/output) COMPLEX array, dimension (LDC,N)
- On entry, the M-by-N matrix C. On exit, C is overwritten by Q*C
- or Q**H*C or C*Q**H or C*Q.
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- LDC (input) INTEGER
- The leading dimension of the array C. LDC >= max(1,M).
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- WORK (workspace/output) COMPLEX array, dimension (LWORK)
- On exit, if INFO = 0, WORK(1) returns the optimal LWORK.
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- LWORK (input) INTEGER
- The dimension of the array WORK. If SIDE = 'L', LWORK >=
- max(1,N); if SIDE = 'R', LWORK >= max(1,M). For optimum
- performance LWORK >= N*NB if SIDE = 'L', and LWORK >= M*NB if
- SIDE = 'R', where NB is the optimal blocksize.
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- INFO (output) INTEGER
- = 0: successful exit
- < 0: if INFO = -i, the i-th argument had an illegal value
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- PPPPaaaaggggeeee 2222
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