LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
 All Classes Files Functions Variables Typedefs Macros
zqrt12.f File Reference

Go to the source code of this file.

Functions/Subroutines

double precision function zqrt12 (M, N, A, LDA, S, WORK, LWORK, RWORK)
 ZQRT12 More...
 

Function/Subroutine Documentation

double precision function zqrt12 ( integer  M,
integer  N,
complex*16, dimension( lda, * )  A,
integer  LDA,
double precision, dimension( * )  S,
complex*16, dimension( lwork )  WORK,
integer  LWORK,
double precision, dimension( * )  RWORK 
)

ZQRT12

Purpose:
 ZQRT12 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 COMPLEX*16 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 COMPLEX*16 array, dimension (LWORK)
[in]LWORK
          LWORK is INTEGER
          The length of the array WORK. LWORK >= M*N + 2*min(M,N) +
          max(M,N).
[out]RWORK
          RWORK is DOUBLE PRECISION array, dimension (2*min(M,N))
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date
November 2011

Definition at line 97 of file zqrt12.f.

Here is the call graph for this function:

Here is the caller graph for this function: