LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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◆ drzt01()

double precision function drzt01 ( integer  m,
integer  n,
double precision, dimension( lda, * )  a,
double precision, dimension( lda, * )  af,
integer  lda,
double precision, dimension( * )  tau,
double precision, dimension( lwork )  work,
integer  lwork 
)

DRZT01

Purpose:
 DRZT01 returns
      || A - R*Q || / ( M * eps * ||A|| )
 for an upper trapezoidal A that was factored with DTZRZF.
Parameters
[in]M
          M is INTEGER
          The number of rows of the matrices A and AF.
[in]N
          N is INTEGER
          The number of columns of the matrices A and AF.
[in]A
          A is DOUBLE PRECISION array, dimension (LDA,N)
          The original upper trapezoidal M by N matrix A.
[in]AF
          AF is DOUBLE PRECISION array, dimension (LDA,N)
          The output of DTZRZF for input matrix A.
          The lower triangle is not referenced.
[in]LDA
          LDA is INTEGER
          The leading dimension of the arrays A and AF.
[in]TAU
          TAU is DOUBLE PRECISION array, dimension (M)
          Details of the Householder transformations as returned by
          DTZRZF.
[out]WORK
          WORK is DOUBLE PRECISION array, dimension (LWORK)
[in]LWORK
          LWORK is INTEGER
          The length of the array WORK.  LWORK >= m*n + m*nb.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.