cunmrq (l) - Linux Manuals

cunmrq: overwrites the general complex M-by-N matrix C with SIDE = aqLaq SIDE = aqRaq TRANS = aqNaq

NAME

CUNMRQ - overwrites the general complex M-by-N matrix C with SIDE = aqLaq SIDE = aqRaq TRANS = aqNaq

SYNOPSIS

SUBROUTINE CUNMRQ(

SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK, LWORK, INFO )

    

CHARACTER SIDE, TRANS

    

INTEGER INFO, K, LDA, LDC, LWORK, M, N

    

COMPLEX A( LDA, * ), C( LDC, * ), TAU( * ), WORK( * )

PURPOSE

CUNMRQ overwrites the general complex M-by-N matrix C with TRANS = aqCaq: Q**H * C C * Q**H
where Q is a complex unitary matrix defined as the product of k elementary reflectors

Q = H(1)aq H(2)aq . . . H(k)aq
as returned by CGERQF. Q is of order M if SIDE = aqLaq and of order N if SIDE = aqRaq.

ARGUMENTS

SIDE (input) CHARACTER*1

= aqLaq: apply Q or Q**H from the Left;
= aqRaq: apply Q or Q**H from the Right.

TRANS (input) CHARACTER*1

= aqNaq: No transpose, apply Q;
= aqCaq: Transpose, apply Q**H.

M (input) INTEGER

The number of rows of the matrix C. M >= 0.

N (input) INTEGER

The number of columns of the matrix C. N >= 0.

K (input) INTEGER

The number of elementary reflectors whose product defines the matrix Q. If SIDE = aqLaq, M >= K >= 0; if SIDE = aqRaq, N >= K >= 0.

A (input) COMPLEX array, dimension

(LDA,M) if SIDE = aqLaq, (LDA,N) if SIDE = aqRaq The i-th row must contain the vector which defines the elementary reflector H(i), for i = 1,2,...,k, as returned by CGERQF in the last k rows of its array argument A. A is modified by the routine but restored on exit.

LDA (input) INTEGER

The leading dimension of the array A. LDA >= max(1,K).

TAU (input) COMPLEX array, dimension (K)

TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by CGERQF.

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.

LDC (input) INTEGER

The leading dimension of the array C. LDC >= max(1,M).

WORK (workspace/output) COMPLEX array, dimension (MAX(1,LWORK))

On exit, if INFO = 0, WORK(1) returns the optimal LWORK.

LWORK (input) INTEGER

The dimension of the array WORK. If SIDE = aqLaq, LWORK >= max(1,N); if SIDE = aqRaq, LWORK >= max(1,M). For optimum performance LWORK >= N*NB if SIDE = aqLaq, and LWORK >= M*NB if SIDE = aqRaq, where NB is the optimal blocksize. If LWORK = -1, then a workspace query is assumed; the routine only calculates the optimal size of the WORK array, returns this value as the first entry of the WORK array, and no error message related to LWORK is issued by XERBLA.

INFO (output) INTEGER

= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value