SYNOPSIS¶
- SUBROUTINE
SLAQR1(
- N, H, LDH, SR1, SI1, SR2, SI2, V )
REAL SI1, SI2, SR1, SR2 INTEGER LDH, N REAL H( LDH, * ), V( * )
REAL ZERO PARAMETER ( ZERO = 0.0e0 ) REAL H21S, H31S, S INTRINSIC ABS IF(
N.EQ.2 ) THEN S = ABS( H( 1, 1 )-SR2 ) + ABS( SI2 ) + ABS( H( 2, 1 ) ) IF(
S.EQ.ZERO ) THEN V( 1 ) = ZERO V( 2 ) = ZERO ELSE H21S = H( 2, 1 ) / S V( 1
) = H21S*H( 1, 2 ) + ( H( 1, 1 )-SR1 )* ( ( H( 1, 1 )-SR2 ) / S ) - SI1*(
SI2 / S ) V( 2 ) = H21S*( H( 1, 1 )+H( 2, 2 )-SR1-SR2 ) END IF ELSE S = ABS(
H( 1, 1 )-SR2 ) + ABS( SI2 ) + ABS( H( 2, 1 ) ) + ABS( H( 3, 1 ) ) IF(
S.EQ.ZERO ) THEN V( 1 ) = ZERO V( 2 ) = ZERO V( 3 ) = ZERO ELSE H21S = H( 2,
1 ) / S H31S = H( 3, 1 ) / S V( 1 ) = ( H( 1, 1 )-SR1 )*( ( H( 1, 1 )-SR2 )
/ S ) - SI1*( SI2 / S ) + H( 1, 2 )*H21S + H( 1, 3 )*H31S V( 2 ) = H21S*( H(
1, 1 )+H( 2, 2 )-SR1-SR2 ) + H( 2, 3 )*H31S V( 3 ) = H31S*( H( 1, 1 )+H( 3,
3 )-SR1-SR2 ) + H21S*H( 3, 2 ) END IF END IF END