LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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dqrt12.f File Reference

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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

      || s - svlues||/(||svlues||*eps*max(M,N))
Parameters
[in]M
          M is INTEGER
          The number of rows of the matrix A.
[in]N
          N is INTEGER
          The number of columns of the matrix A.
[in]A
          A is DOUBLE PRECISION array, dimension (LDA,N)
          The M-by-N matrix A. Only the upper trapezoid is referenced.
[in]LDA
          LDA is INTEGER
          The leading dimension of the array A.
[in]S
          S is DOUBLE PRECISION array, dimension (min(M,N))
          The singular values of the matrix A.
[out]WORK
          WORK is DOUBLE PRECISION array, dimension (LWORK)
[in]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.
Date
November 2011

Definition at line 90 of file dqrt12.f.

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