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LAPACK-3

man page of LAPACK-3

LAPACK-3: applies a complex elementary reflector H to a complex M-by-N matrix C, from either the left or the right

NAME
LAPACK-3 - applies a complex elementary reflector H to a complex M-by-N matrix C, from either the left or the right
SYNOPSIS
SUBROUTINE ZLARF( SIDE, M, N, V, INCV, TAU, C, LDC, WORK ) IMPLICIT NONE CHARACTER SIDE INTEGER INCV, LDC, M, N COMPLEX*16 TAU COMPLEX*16 C( LDC, * ), V( * ), WORK( * )

PURPOSE

ZLARF 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 H = I - tau * v * v' where tau is a complex scalar and v is a complex vector. If tau = 0, then H is taken to be the unit matrix. To apply H' (the conjugate transpose of H), supply conjg(tau) instead tau.

ARGUMENTS

SIDE (input) CHARACTER*1 = 'L': form H * C = 'R': form C * H M (input) INTEGER The number of rows of the matrix C. N (input) INTEGER The number of columns of the matrix C. V (input) COMPLEX*16 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. INCV (input) INTEGER The increment between elements of v. INCV <> 0. TAU (input) COMPLEX*16 The value tau in the representation of H. C (input/output) COMPLEX*16 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'. LDC (input) INTEGER The leading dimension of the array C. LDC >= max(1,M). WORK (workspace) COMPLEX*16 array, dimension (N) if SIDE = 'L' or (M) if SIDE = 'R' LAPACK auxiliary routine (versionMarch 2011 LAPACK-3(3)
 
 
 

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