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LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
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LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
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| subroutine clarzb | ( | character | side, |
| character | trans, | ||
| character | direct, | ||
| character | storev, | ||
| integer | m, | ||
| integer | n, | ||
| integer | k, | ||
| integer | l, | ||
| complex, dimension( ldv, * ) | v, | ||
| integer | ldv, | ||
| complex, dimension( ldt, * ) | t, | ||
| integer | ldt, | ||
| complex, dimension( ldc, * ) | c, | ||
| integer | ldc, | ||
| complex, dimension( ldwork, * ) | work, | ||
| integer | ldwork | ||
| ) |
CLARZB applies a block reflector or its conjugate-transpose to a general matrix.
Download CLARZB + dependencies [TGZ] [ZIP] [TXT]
CLARZB applies a complex block reflector H or its transpose H**H to a complex distributed M-by-N C from the left or the right. Currently, only STOREV = 'R' and DIRECT = 'B' are supported.
| [in] | SIDE | SIDE is CHARACTER*1
= 'L': apply H or H**H from the Left
= 'R': apply H or H**H from the Right |
| [in] | TRANS | TRANS is CHARACTER*1
= 'N': apply H (No transpose)
= 'C': apply H**H (Conjugate transpose) |
| [in] | DIRECT | DIRECT is CHARACTER*1
Indicates how H is formed from a product of elementary
reflectors
= 'F': H = H(1) H(2) . . . H(k) (Forward, not supported yet)
= 'B': H = H(k) . . . H(2) H(1) (Backward) |
| [in] | STOREV | STOREV is CHARACTER*1
Indicates how the vectors which define the elementary
reflectors are stored:
= 'C': Columnwise (not supported yet)
= 'R': Rowwise |
| [in] | M | M is INTEGER
The number of rows of the matrix C. |
| [in] | N | N is INTEGER
The number of columns of the matrix C. |
| [in] | K | K is INTEGER
The order of the matrix T (= the number of elementary
reflectors whose product defines the block reflector). |
| [in] | L | L is INTEGER
The number of columns of the matrix V containing the
meaningful part of the Householder reflectors.
If SIDE = 'L', M >= L >= 0, if SIDE = 'R', N >= L >= 0. |
| [in] | V | V is COMPLEX array, dimension (LDV,NV).
If STOREV = 'C', NV = K; if STOREV = 'R', NV = L. |
| [in] | LDV | LDV is INTEGER
The leading dimension of the array V.
If STOREV = 'C', LDV >= L; if STOREV = 'R', LDV >= K. |
| [in] | T | T is COMPLEX array, dimension (LDT,K)
The triangular K-by-K matrix T in the representation of the
block reflector. |
| [in] | LDT | LDT is INTEGER
The leading dimension of the array T. LDT >= K. |
| [in,out] | C | C is COMPLEX array, dimension (LDC,N)
On entry, the M-by-N matrix C.
On exit, C is overwritten by H*C or H**H*C or C*H or C*H**H. |
| [in] | LDC | LDC is INTEGER
The leading dimension of the array C. LDC >= max(1,M). |
| [out] | WORK | WORK is COMPLEX array, dimension (LDWORK,K) |
| [in] | LDWORK | LDWORK is INTEGER
The leading dimension of the array WORK.
If SIDE = 'L', LDWORK >= max(1,N);
if SIDE = 'R', LDWORK >= max(1,M). |
1.9.8