NAME

TESTING/LIN/dqrt12.f

SYNOPSIS

Functions/Subroutines

double precision function dqrt12 (m, n, a, lda, s, work, lwork)
DQRT12

Function/Subroutine Documentation

double precision function dqrt12 (integer m, integer n, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( * ) s, double precision, dimension( lwork ) work, integer lwork)

DQRT12

Purpose:



 DQRT12 computes the singular values `svlues' of the upper trapezoid


 of A(1:M,1:N) and returns the ratio


      || svlues - s ||/(||s||*eps*max(M,N))

Parameters



          M is INTEGER


          The number of rows of the matrix A.



          N is INTEGER


          The number of columns of the matrix A.



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


          The M-by-N matrix A. Only the upper trapezoid is referenced.

LDA



          LDA is INTEGER


          The leading dimension of the array A.



          S is DOUBLE PRECISION array, dimension (min(M,N))


          The singular values of the matrix A.

WORK



          WORK is DOUBLE PRECISION array, dimension (LWORK)

LWORK



          LWORK is INTEGER


          The length of the array WORK. LWORK >= max(M*N + 4*min(M,N) +


          max(M,N), M*N+2*MIN( M, N )+4*N).

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 88 of file dqrt12.f.

Author

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