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- ZZZZUUUUPPPPMMMMTTTTRRRR((((3333FFFF)))) ZZZZUUUUPPPPMMMMTTTTRRRR((((3333FFFF))))
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- NNNNAAAAMMMMEEEE
- ZUPMTR - overwrite the general complex M-by-N matrix C with SIDE = 'L'
- SIDE = 'R' TRANS = 'N'
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE ZUPMTR( SIDE, UPLO, TRANS, M, N, AP, TAU, C, LDC, WORK, INFO )
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- CHARACTER SIDE, TRANS, UPLO
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- INTEGER INFO, LDC, M, N
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- COMPLEX*16 AP( * ), C( LDC, * ), TAU( * ), WORK( * )
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- ZUPMTR 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 of order nq, with nq = m if SIDE =
- 'L' and nq = n if SIDE = 'R'. Q is defined as the product of nq-1
- elementary reflectors, as returned by ZHPTRD using packed storage:
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- if UPLO = 'U', Q = H(nq-1) . . . H(2) H(1);
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- if UPLO = 'L', Q = H(1) H(2) . . . H(nq-1).
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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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- UPLO (input) CHARACTER*1
- = 'U': Upper triangular packed storage used in previous call to
- ZHPTRD; = 'L': Lower triangular packed storage used in previous
- call to ZHPTRD.
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- TRANS (input) CHARACTER*1
- = 'N': No transpose, apply Q;
- = 'C': Conjugate 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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- AP (input) COMPLEX*16 array, dimension
- (M*(M+1)/2) if SIDE = 'L' (N*(N+1)/2) if SIDE = 'R' The vectors
- which define the elementary reflectors, as returned by ZHPTRD.
- AP is modified by the routine but restored on exit.
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- PPPPaaaaggggeeee 1111
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- ZZZZUUUUPPPPMMMMTTTTRRRR((((3333FFFF)))) ZZZZUUUUPPPPMMMMTTTTRRRR((((3333FFFF))))
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- TAU (input) COMPLEX*16 array, dimension (M-1) if SIDE = 'L'
- or (N-1) if SIDE = 'R' TAU(i) must contain the scalar factor of
- the elementary reflector H(i), as returned by ZHPTRD.
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- C (input/output) COMPLEX*16 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) COMPLEX*16 array, dimension
- (N) if SIDE = 'L' (M) if SIDE = 'R'
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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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