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dgemqr.f(3) | LAPACK | dgemqr.f(3) |
NAME¶
dgemqr.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine dgemqr (SIDE, TRANS, M, N, K, A, LDA, T, TSIZE, C, LDC, WORK, LWORK, INFO)
Function/Subroutine Documentation¶
subroutine dgemqr (characterSIDE, characterTRANS, integerM, integerN, integerK, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( * )T, integerTSIZE, double precision, dimension( ldc, * )C, integerLDC, double precision, dimension( * )WORK, integerLWORK, integerINFO)¶
Purpose:SIDE
Author:
SIDE is CHARACTER*1 = 'L': apply Q or Q**T from the Left; = 'R': apply Q or Q**T from the Right.TRANS
TRANS is CHARACTER*1 = 'N': No transpose, apply Q; = 'T': Transpose, apply Q**T.M
M is INTEGER The number of rows of the matrix A. M >=0.N
N is INTEGER The number of columns of the matrix C. N >= 0.K
K is INTEGER The number of elementary reflectors whose product defines the matrix Q. If SIDE = 'L', M >= K >= 0; if SIDE = 'R', N >= K >= 0.A
A is DOUBLE PRECISION array, dimension (LDA,K) Part of the data structure to represent Q as returned by DGEQR.LDA
LDA is INTEGER The leading dimension of the array A. If SIDE = 'L', LDA >= max(1,M); if SIDE = 'R', LDA >= max(1,N).T
T is DOUBLE PRECISION array, dimension (MAX(5,TSIZE)). Part of the data structure to represent Q as returned by DGEQR.TSIZE
TSIZE is INTEGER The dimension of the array T. TSIZE >= 5.C
C is DOUBLE PRECISION array, dimension (LDC,N) On entry, the M-by-N matrix C. On exit, C is overwritten by Q*C or Q**T*C or C*Q**T or C*Q.LDC
LDC is INTEGER The leading dimension of the array C. LDC >= max(1,M).WORK
(workspace) DOUBLE PRECISION array, dimension (MAX(1,LWORK))LWORK
LWORK is INTEGER The dimension of the array WORK. If LWORK = -1, then a workspace query is assumed. The routine only calculates the size of the WORK array, returns this value as WORK(1), and no error message related to WORK is issued by XERBLA.INFO
INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Further Details
Author¶
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