drzt01.f - Man Page

double precision function drzt01 (m, n, a, af, lda, tau, work, lwork)
DRZT01

DRZT01

Purpose:

 DRZT01 returns
      || A - R*Q || / ( M * eps * ||A|| )
 for an upper trapezoidal A that was factored with DTZRZF.

Parameters

M

          M is INTEGER
          The number of rows of the matrices A and AF.

N

          N is INTEGER
          The number of columns of the matrices A and AF.

A

          A is DOUBLE PRECISION array, dimension (LDA,N)
          The original upper trapezoidal M by N matrix A.

AF

          AF is DOUBLE PRECISION array, dimension (LDA,N)
          The output of DTZRZF for input matrix A.
          The lower triangle is not referenced.

LDA

          LDA is INTEGER
          The leading dimension of the arrays A and AF.

TAU

          TAU is DOUBLE PRECISION array, dimension (M)
          Details of the Householder transformations as returned by
          DTZRZF.

WORK

          WORK is DOUBLE PRECISION array, dimension (LWORK)

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.

Definition at line 96 of file drzt01.f.