diff options
Diffstat (limited to 'SRC/zlaqr1.f')
| -rw-r--r-- | SRC/zlaqr1.f | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/SRC/zlaqr1.f b/SRC/zlaqr1.f index ba62ccd9..a12c3d82 100644 --- a/SRC/zlaqr1.f +++ b/SRC/zlaqr1.f @@ -12,6 +12,9 @@ COMPLEX*16 H( LDH, * ), V( * ) * .. * +* Purpose +* ======= +* * Given a 2-by-2 or 3-by-3 matrix H, ZLAQR1 sets v to a * scalar multiple of the first column of the product * @@ -22,6 +25,8 @@ * This is useful for starting double implicit shift bulges * in the QR algorithm. * +* Arguments +* ========= * * N (input) integer * Order of the matrix H. N must be either 2 or 3. @@ -40,12 +45,14 @@ * A scalar multiple of the first column of the * matrix K in (*). * -* ================================================================ +* Further Details +* =============== +* * Based on contributions by * Karen Braman and Ralph Byers, Department of Mathematics, * University of Kansas, USA * -* ================================================================ +* ================================================================ * * .. Parameters .. COMPLEX*16 ZERO |