 |
LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
|
|
LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
|
| subroutine slaqz4 | ( | 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, | ||
| real, dimension( * ), intent(inout) | sr, | ||
| real, dimension( * ), intent(inout) | si, | ||
| real, dimension( * ), intent(inout) | ss, | ||
| real, dimension( lda, * ), intent(inout) | a, | ||
| integer, intent(in) | lda, | ||
| real, dimension( ldb, * ), intent(inout) | b, | ||
| integer, intent(in) | ldb, | ||
| real, dimension( ldq, * ), intent(inout) | q, | ||
| integer, intent(in) | ldq, | ||
| real, dimension( ldz, * ), intent(inout) | z, | ||
| integer, intent(in) | ldz, | ||
| real, dimension( ldqc, * ), intent(inout) | qc, | ||
| integer, intent(in) | ldqc, | ||
| real, dimension( ldzc, * ), intent(inout) | zc, | ||
| integer, intent(in) | ldzc, | ||
| real, dimension( * ), intent(inout) | work, | ||
| integer, intent(in) | lwork, | ||
| integer, intent(out) | info | ||
| ) |
SLAQZ4
Download SLAQZ4 + dependencies [TGZ] [ZIP] [TXT]
SLAQZ4 Executes a single multishift QZ sweep
| [in] | ILSCHUR | ILSCHUR is LOGICAL
Determines whether or not to update the full Schur form |
| [in] | ILQ | ILQ is LOGICAL
Determines whether or not to update the matrix Q |
| [in] | ILZ | ILZ is LOGICAL
Determines whether or not to update the matrix Z |
| [in] | N | N is INTEGER
The order of the matrices A, B, Q, and Z. N >= 0. |
| [in] | ILO | ILO is INTEGER |
| [in] | IHI | IHI is INTEGER |
| [in] | NSHIFTS | NSHIFTS is INTEGER
The desired number of shifts to use |
| [in] | NBLOCK_DESIRED | NBLOCK_DESIRED is INTEGER
The desired size of the computational windows |
| [in] | SR | SR is REAL array. SR contains
the real parts of the shifts to use. |
| [in] | SI | SI is REAL array. SI contains
the imaginary parts of the shifts to use. |
| [in] | SS | SS is REAL array. SS contains
the scale of the shifts to use. |
| [in,out] | A | A is REAL array, dimension (LDA, N) |
| [in] | LDA | LDA is INTEGER
The leading dimension of the array A. LDA >= max( 1, N ). |
| [in,out] | B | B is REAL array, dimension (LDB, N) |
| [in] | LDB | LDB is INTEGER
The leading dimension of the array B. LDB >= max( 1, N ). |
| [in,out] | Q | Q is REAL array, dimension (LDQ, N) |
| [in] | LDQ | LDQ is INTEGER |
| [in,out] | Z | Z is REAL array, dimension (LDZ, N) |
| [in] | LDZ | LDZ is INTEGER |
| [in,out] | QC | QC is REAL array, dimension (LDQC, NBLOCK_DESIRED) |
| [in] | LDQC | LDQC is INTEGER |
| [in,out] | ZC | ZC is REAL array, dimension (LDZC, NBLOCK_DESIRED) |
| [in] | LDZC | LDZ is INTEGER |
| [out] | WORK | WORK is REAL array, dimension (MAX(1,LWORK))
On exit, if INFO >= 0, WORK(1) returns the optimal LWORK. |
| [in] | 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. |
| [out] | INFO | INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value |
1.9.8