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LAPACK: Linear Algebra PACKage
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dtzt01.f File Reference

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Functions/Subroutines

DOUBLE PRECISION function dtzt01 (M, N, A, AF, LDA, TAU, WORK, LWORK)
 DTZT01 More...
 

Function/Subroutine Documentation

DOUBLE PRECISION function dtzt01 ( 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 
)

DTZT01

Purpose:
 DTZT01 returns
      || A - R*Q || / ( M * eps * ||A|| )
 for an upper trapezoidal A that was factored with DTZRQF.
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 DTZRQF 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
          DTZRQF.
[out]WORK
          WORK is DOUBLE PRECISION array, dimension (LWORK)
[in]LWORK
          LWORK is INTEGER
          The length of the array WORK.  LWORK >= m*n + m.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date
November 2011

Definition at line 98 of file dtzt01.f.

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