LAPACK 3.11.0
LAPACK: Linear Algebra PACKage

◆ dget40()

subroutine dget40 ( double precision  RMAX,
integer  LMAX,
integer, dimension( 2 )  NINFO,
integer  KNT,
integer  NIN 
)

DGET40

Purpose:
 DGET40 tests DTGEXC, a routine for swapping adjacent blocks (either
 1 by 1 or 2 by 2) on the diagonal of a pencil in real generalized Schur form.
 Thus, DTGEXC computes an orthogonal matrices Q and Z such that

     Q' * ( [ A B ], [ D E ] ) * Z  = ( [ C1 B1 ], [ F1 E1 ] )
          ( [ 0 C ]  [   F ] )        ( [ 0  A1 ]  [    D1]  )

 where (C1,F1) is similar to (C,F) and (A1,D1) is similar to (A,D).
 Both (A,D) and (C,F) are assumed to be in standard form
 and (A1,D1) and (C1,F1) are returned with the
 same properties.
Parameters
[out]RMAX
          RMAX is DOUBLE PRECISION
          Value of the largest test ratio.
[out]LMAX
          LMAX is INTEGER
          Example number where largest test ratio achieved.
[out]NINFO
          NINFO is INTEGER array, dimension (2)
          NINFO( 1 ) = DTGEXC without accumulation returned INFO nonzero
          NINFO( 2 ) = DTGEXC with accumulation returned INFO nonzero
[out]KNT
          KNT is INTEGER
          Total number of examples tested.
[in]NIN
          NIN is INTEGER
          Input logical unit number.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.