diff options
Diffstat (limited to 'SRC/claqr5.f')
| -rw-r--r-- | SRC/claqr5.f | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/SRC/claqr5.f b/SRC/claqr5.f index 5ea34429..7199183a 100644 --- a/SRC/claqr5.f +++ b/SRC/claqr5.f @@ -16,9 +16,15 @@ $ WH( LDWH, * ), WV( LDWV, * ), Z( LDZ, * ) * .. * -* This auxiliary subroutine called by CLAQR0 performs a +* Purpose +* ======= +* +* CLAQR5 called by CLAQR0 performs a * single small-bulge multi-shift QR sweep. * +* Arguments +* ========= +* * WANTT (input) logical scalar * WANTT = .true. if the triangular Schur factor * is being computed. WANTT is set to .false. otherwise. @@ -45,6 +51,7 @@ * subroutine operates. * * KTOP (input) integer scalar +* * KBOT (input) integer scalar * These are the first and last rows and columns of an * isolated diagonal block upon which the QR sweep is to be @@ -72,6 +79,7 @@ * calling procedure. LDH.GE.MAX(1,N). * * ILOZ (input) INTEGER +* * IHIZ (input) INTEGER * Specify the rows of Z to which transformations must be * applied if WANTZ is .TRUE.. 1 .LE. ILOZ .LE. IHIZ .LE. N @@ -120,12 +128,13 @@ * LDWV is the leading dimension of WV as declared in the * in the calling subroutine. LDWV.GE.NV. * -* ================================================================ +* Further Details +* =============== +* * Based on contributions by * Karen Braman and Ralph Byers, Department of Mathematics, * University of Kansas, USA * -* ================================================================ * Reference: * * K. Braman, R. Byers and R. Mathias, The Multi-Shift QR @@ -133,7 +142,7 @@ * Level 3 Performance, SIAM Journal of Matrix Analysis, * volume 23, pages 929--947, 2002. * -* ================================================================ +* ================================================================ * .. Parameters .. COMPLEX ZERO, ONE PARAMETER ( ZERO = ( 0.0e0, 0.0e0 ), |