Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
Contents

?laqr3

Performs the orthogonal/unitary similarity transformation of a Hessenberg matrix to detect and deflate fully converged eigenvalues from a trailing principal submatrix (aggressive early deflation).

Syntax

call slaqr3
(
wantt
,
wantz
,
n
,
ktop
,
kbot
,
nw
,
h
,
ldh
,
iloz
,
ihiz
,
z
,
ldz
,
ns
,
nd
,
sr
,
si
,
v
,
ldv
,
nh
,
t
,
ldt
,
nv
,
wv
,
ldwv
,
work
,
lwork
)
call dlaqr3
(
wantt
,
wantz
,
n
,
ktop
,
kbot
,
nw
,
h
,
ldh
,
iloz
,
ihiz
,
z
,
ldz
,
ns
,
nd
,
sr
,
si
,
v
,
ldv
,
nh
,
t
,
ldt
,
nv
,
wv
,
ldwv
,
work
,
lwork
)
call claqr3
(
wantt
,
wantz
,
n
,
ktop
,
kbot
,
nw
,
h
,
ldh
,
iloz
,
ihiz
,
z
,
ldz
,
ns
,
nd
,
sh
,
v
,
ldv
,
nh
,
t
,
ldt
,
nv
,
wv
,
ldwv
,
work
,
lwork
)
call zlaqr3
(
wantt
,
wantz
,
n
,
ktop
,
kbot
,
nw
,
h
,
ldh
,
iloz
,
ihiz
,
z
,
ldz
,
ns
,
nd
,
sh
,
v
,
ldv
,
nh
,
t
,
ldt
,
nv
,
wv
,
ldwv
,
work
,
lwork
)
Include Files
  • mkl.fi
Description
The routine accepts as input an upper Hessenberg matrix
H
and performs an orthogonal/unitary similarity transformation designed to detect and deflate fully converged eigenvalues from a trai