SRC/claqz3.f(3) | Library Functions Manual | SRC/claqz3.f(3) |
NAME
SRC/claqz3.f
SYNOPSIS
Functions/Subroutines
subroutine claqz3 (ilschur, ilq, ilz, n, ilo, ihi, nshifts,
nblock_desired, alpha, beta, a, lda, b, ldb, q, ldq, z, ldz, qc, ldqc, zc,
ldzc, work, lwork, info)
CLAQZ3
Function/Subroutine Documentation
subroutine claqz3 (logical, intent(in) ilschur, logical, intent(in) ilq, logical, intent(in) ilz, integer, intent(in) n, integer, intent(in) ilo, integer, intent(in) ihi, integer, intent(in) nshifts, integer, intent(in) nblock_desired, complex, dimension( * ), intent(inout) alpha, complex, dimension( * ), intent(inout) beta, complex, dimension( lda, * ), intent(inout) a, integer, intent(in) lda, complex, dimension( ldb, * ), intent(inout) b, integer, intent(in) ldb, complex, dimension( ldq, * ), intent(inout) q, integer, intent(in) ldq, complex, dimension( ldz, * ), intent(inout) z, integer, intent(in) ldz, complex, dimension( ldqc, * ), intent(inout) qc, integer, intent(in) ldqc, complex, dimension( ldzc, * ), intent(inout) zc, integer, intent(in) ldzc, complex, dimension( * ), intent(inout) work, integer, intent(in) lwork, integer, intent(out) info)
CLAQZ3
Purpose:
CLAQZ3 Executes a single multishift QZ sweep
Parameters
ILSCHUR
ILSCHUR is LOGICAL Determines whether or not to update the full Schur form
ILQ
ILQ is LOGICAL Determines whether or not to update the matrix Q
ILZ
ILZ is LOGICAL Determines whether or not to update the matrix Z
N
N is INTEGER The order of the matrices A, B, Q, and Z. N >= 0.
ILO
ILO is INTEGER
IHI
IHI is INTEGER
NSHIFTS
NSHIFTS is INTEGER The desired number of shifts to use
NBLOCK_DESIRED
NBLOCK_DESIRED is INTEGER The desired size of the computational windows
ALPHA
ALPHA is COMPLEX array. SR contains the alpha parts of the shifts to use.
BETA
BETA is COMPLEX array. SS contains the scale of the shifts to use.
A
A is COMPLEX array, dimension (LDA, N)
LDA
LDA is INTEGER The leading dimension of the array A. LDA >= max( 1, N ).
B
B is COMPLEX array, dimension (LDB, N)
LDB
LDB is INTEGER The leading dimension of the array B. LDB >= max( 1, N ).
Q
Q is COMPLEX array, dimension (LDQ, N)
LDQ
LDQ is INTEGER
Z
Z is COMPLEX array, dimension (LDZ, N)
LDZ
LDZ is INTEGER
QC
QC is COMPLEX array, dimension (LDQC, NBLOCK_DESIRED)
LDQC
LDQC is INTEGER
ZC
ZC is COMPLEX array, dimension (LDZC, NBLOCK_DESIRED)
LDZC
LDZ is INTEGER
WORK
WORK is COMPLEX array, dimension (MAX(1,LWORK)) On exit, if INFO >= 0, WORK(1) returns the optimal LWORK.
LWORK
LWORK is INTEGER The dimension of the array WORK. LWORK >= max(1,N). 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
INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value
Author
Thijs Steel, KU Leuven
Date
May 2020
Definition at line 203 of file claqz3.f.
Author
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