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- CLARF - applie a complex elementary reflector H to a complex M-by-N
- matrix C, from either the left or the right
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- SUBROUTINE CLARF( SIDE, M, N, V, INCV, TAU, C, LDC, WORK )
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- CHARACTER SIDE
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- INTEGER INCV, LDC, M, N
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- COMPLEX TAU
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- COMPLEX C( LDC, * ), V( * ), WORK( * )
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- CLARF applies a complex elementary reflector H to a complex M-by-N matrix
- C, from either the left or the right. H is represented in the form
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- H = I - tau * v * v'
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- where tau is a complex scalar and v is a complex vector.
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- If tau = 0, then H is taken to be the unit matrix.
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- To apply H' (the conjugate transpose of H), supply conjg(tau) instead
- tau.
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- SIDE (input) CHARACTER*1
- = 'L': form H * C
- = 'R': form C * H
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- M (input) INTEGER
- The number of rows of the matrix C.
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- N (input) INTEGER
- The number of columns of the matrix C.
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- V (input) COMPLEX array, dimension
- (1 + (M-1)*abs(INCV)) if SIDE = 'L' or (1 + (N-1)*abs(INCV)) if
- SIDE = 'R' The vector v in the representation of H. V is not used
- if TAU = 0.
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- INCV (input) INTEGER
- The increment between elements of v. INCV <> 0.
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- TAU (input) COMPLEX
- The value tau in the representation of H.
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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 the
- matrix H * C if SIDE = 'L', or C * H if SIDE = 'R'.
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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 array, dimension
- (N) if SIDE = 'L' or (M) if SIDE = 'R'
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