Contents
srotmg - Construct a Gentleman's modified Given's plane
rotation
SUBROUTINE SROTMG(D1, D2, B1, B2, PARAM)
REAL D1, D2, B1, B2
REAL PARAM(*)
SUBROUTINE SROTMG_64(D1, D2, B1, B2, PARAM)
REAL D1, D2, B1, B2
REAL PARAM(*)
F95 INTERFACE
SUBROUTINE ROTMG(D1, D2, B1, B2, PARAM)
REAL :: D1, D2, B1, B2
REAL, DIMENSION(:) :: PARAM
SUBROUTINE ROTMG_64(D1, D2, B1, B2, PARAM)
REAL :: D1, D2, B1, B2
REAL, DIMENSION(:) :: PARAM
C INTERFACE
#include <sunperf.h>
void srotmg(float d1, float d2, float b1, float b2, float
*param);
void srotmg_64(float d1, float d2, float b1, float b2, float
*param);
srotmg Construct Gentleman's modified a Given's plane rota-
tion that will annihilate an element of a vector.
D1 (input/output)
On entry, the first diagonal entry in the H
matrix. On exit, changed to reflect the effect of
the transformation.
D2 (input/output)
On entry, the second diagonal entry in the H
matrix. On exit, changed to reflect the effect of
the transformation.
B1 (input/output)
On entry, the first element of the vector to which
the H matrix is applied. On exit, changed to
reflect the effect of the transformation.
B2 (input)
On entry, the second element of the vector to
which the H matrix is applied. Unchanged on exit.
PARAM (output)
On exit, PARAM(1) describes the form of the rota-
tion matrix H, and PARAM(2..5) contain the H
matrix.
If PARAM(1) = -2 then H = I and no elements of
PARAM are modified.
If PARAM(1) = -1 then PARAM(2) = h11, PARAM(3) =
h21, PARAM(4) = h12, and PARAM(5) = h22.
If PARAM(1) = 0 then h11 = h22 = 1, PARAM(3) =
h21, and PARAM(4) = h12.
If PARAM(1) = 1 then h12 = 1, h21 = -1, PARAM(2) =
h11, and PARAM(5) = h22.