NAME

TESTING/LIN/drzt01.f

SYNOPSIS

Functions/Subroutines

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

Function/Subroutine Documentation

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



          M is INTEGER


          The number of rows of the matrices A and AF.



          N is INTEGER


          The number of columns of the matrices A and AF.



          A is DOUBLE PRECISION array, dimension (LDA,N)


          The original upper trapezoidal M by N matrix A.



          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.

Author

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