cungr2
cungr2 - generate an m by n complex matrix Q with orthonormal rows,
SUBROUTINE CUNGR2( M, N, K, A, LDA, TAU, WORK, INFO)
COMPLEX A(LDA,*), TAU(*), WORK(*)
INTEGER M, N, K, LDA, INFO
SUBROUTINE CUNGR2_64( M, N, K, A, LDA, TAU, WORK, INFO)
COMPLEX A(LDA,*), TAU(*), WORK(*)
INTEGER*8 M, N, K, LDA, INFO
SUBROUTINE UNGR2( [M], [N], [K], A, [LDA], TAU, [WORK], [INFO])
COMPLEX, DIMENSION(:) :: TAU, WORK
COMPLEX, DIMENSION(:,:) :: A
INTEGER :: M, N, K, LDA, INFO
SUBROUTINE UNGR2_64( [M], [N], [K], A, [LDA], TAU, [WORK], [INFO])
COMPLEX, DIMENSION(:) :: TAU, WORK
COMPLEX, DIMENSION(:,:) :: A
INTEGER(8) :: M, N, K, LDA, INFO
#include <sunperf.h>
void cungr2(int m, int n, int k, complex *a, int lda, complex *tau, int *info);
void cungr2_64(long m, long n, long k, complex *a, long lda, complex *tau, long *info);
cungr2 generates an m by n complex matrix Q with orthonormal rows,
which is defined as the last m rows of a product of k elementary
reflectors of order n
Q = H(1)' H(2)' . . . H(k)'
as returned by CGERQF.
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* M (input)
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The number of rows of the matrix Q. M >= 0.
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* N (input)
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The number of columns of the matrix Q. N >= M.
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* K (input)
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The number of elementary reflectors whose product defines the
matrix Q. M >= K >= 0.
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* A (input/output)
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On entry, the (m-k+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.
On exit, the m-by-n matrix Q.
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* LDA (input)
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The first dimension of the array A. LDA >= max(1,M).
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* TAU (input)
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TAU(i) must contain the scalar factor of the elementary
reflector H(i), as returned by CGERQF.
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* WORK (workspace)
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dimension(M)
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* INFO (output)
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