cqrt12.f - Man Page

real function cqrt12 (m, n, a, lda, s, work, lwork, rwork)
CQRT12

CQRT12

Purpose:

 CQRT12 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

          M is INTEGER
          The number of rows of the matrix A.

N

          N is INTEGER
          The number of columns of the matrix A.

A

          A is COMPLEX 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

          S is REAL array, dimension (min(M,N))
          The singular values of the matrix A.

WORK

          WORK is COMPLEX array, dimension (LWORK)

LWORK

          LWORK is INTEGER
          The length of the array WORK. LWORK >= M*N + 2*min(M,N) +
          max(M,N).

RWORK

          RWORK is REAL array, dimension (4*min(M,N))

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 95 of file cqrt12.f.