DLASQ4 - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)
NAMEDLASQ4 - computes an approximation TAU to the smallest eigenvalue using values of d from the previous transform
SYNOPSISSUBROUTINE DLASQ4(  I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU, TTYPE, G )  INTEGER I0, N0, N0IN, PP, TTYPE  DOUBLE PRECISION DMIN, DMIN1, DMIN2, DN, DN1, DN2, G, TAU  DOUBLE PRECISION Z( * )
PURPOSEDLASQ4 computes an approximation TAU to the smallest eigenvalue using values of d from the previous transform. I0 (input) INTEGER

      First index.
N0 (input) INTEGER

      Last index.
Z (input) DOUBLE PRECISION array, dimension ( 4*N )

      Z holds the qd array.
PP (input) INTEGER

      PP=0 for ping, PP=1 for pong.
NOIN (input) INTEGER

      The value of N0 at start of EIGTEST.
DMIN (input) DOUBLE PRECISION

      Minimum value of d.
DMIN1 (input) DOUBLE PRECISION

      Minimum value of d, excluding D( N0 ).
DMIN2 (input) DOUBLE PRECISION

      Minimum value of d, excluding D( N0 ) and D( N0-1 ). DN (input) DOUBLE PRECISION

      d(N)
DN1 (input) DOUBLE PRECISION

      d(N-1)
DN2 (input) DOUBLE PRECISION

      d(N-2)
TAU (output) DOUBLE PRECISION

      This is the shift.
TTYPE (output) INTEGER

      Shift type.
G (input/output) REAL

      G is passed as an argument in order to save its value between
      calls to DLASQ4.
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