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RedHat 9 (Linux i386) - man page for cung2l (redhat section l)

CUNG2L(l)						  )						    CUNG2L(l)

NAME
CUNG2L - generate an m by n complex matrix Q with orthonormal columns,
SYNOPSIS
SUBROUTINE CUNG2L( M, N, K, A, LDA, TAU, WORK, INFO ) INTEGER INFO, K, LDA, M, N COMPLEX A( LDA, * ), TAU( * ), WORK( * )
PURPOSE
CUNG2L generates an m by n complex matrix Q with orthonormal columns, which is defined as the last n columns of a product of k elementary reflectors of order m Q = H(k) . . . H(2) H(1) as returned by CGEQLF.
ARGUMENTS
M (input) INTEGER The number of rows of the matrix Q. M >= 0. N (input) INTEGER The number of columns of the matrix Q. M >= N >= 0. K (input) INTEGER The number of elementary reflectors whose product defines the matrix Q. N >= K >= 0. A (input/output) COMPLEX array, dimension (LDA,N) On entry, the (n-k+i)-th column must contain the vector which defines the elementary reflector H(i), for i = 1,2,...,k, as returned by CGEQLF in the last k columns of its array argument A. On exit, the m-by-n matrix Q. LDA (input) INTEGER The first dimension of the array A. LDA >= max(1,M). TAU (input) COMPLEX array, dimension (K) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by CGEQLF. WORK (workspace) COMPLEX array, dimension (N) INFO (output) INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument has an illegal value LAPACK version 3.0 15 June 2000 CUNG2L(l)


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