NAME

TESTING/LIN/sqrt12.f

SYNOPSIS

Functions/Subroutines

real function sqrt12 (m, n, a, lda, s, work, lwork)
SQRT12

Function/Subroutine Documentation

real function sqrt12 (integer m, integer n, real, dimension( lda, * ) a, integer lda, real, dimension( * ) s, real, dimension( lwork ) work, integer lwork)

SQRT12

Purpose:



 SQRT12 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 REAL 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 REAL array, dimension (min(M,N))


          The singular values of the matrix A.

WORK



          WORK is REAL 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 sqrt12.f.

Author

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