DTZT01
Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
November 2006
November 2006
Purpose
DTZT01 returns
|| A - R*Q || / ( M * eps * ||A|| )
for an upper trapezoidal A that was factored with DTZRQF.
|| A - R*Q || / ( M * eps * ||A|| )
for an upper trapezoidal A that was factored with DTZRQF.
Arguments
| M |
(input) INTEGER
The number of rows of the matrices A and AF.
|
| N |
(input) INTEGER
The number of columns of the matrices A and AF.
|
| A |
(input) DOUBLE PRECISION array, dimension (LDA,N)
The original upper trapezoidal M by N matrix A.
|
| AF |
(input) DOUBLE PRECISION array, dimension (LDA,N)
The output of DTZRQF for input matrix A.
The lower triangle is not referenced. |
| LDA |
(input) INTEGER
The leading dimension of the arrays A and AF.
|
| TAU |
(input) DOUBLE PRECISION array, dimension (M)
Details of the Householder transformations as returned by
DTZRQF. |
| WORK |
(workspace) DOUBLE PRECISION array, dimension (LWORK)
|
| LWORK |
(input) INTEGER
The length of the array WORK. LWORK >= m*n + m.
|