LAPACK
3.4.2
LAPACK: Linear Algebra PACKage

Go to the source code of this file.
Functions/Subroutines  
subroutine  slasq5 (I0, N0, Z, PP, TAU, SIGMA, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE, EPS) 
SLASQ5 computes one dqds transform in pingpong form. Used by sbdsqr and sstegr. 
subroutine slasq5  (  integer  I0, 
integer  N0,  
real, dimension( * )  Z,  
integer  PP,  
real  TAU,  
real  SIGMA,  
real  DMIN,  
real  DMIN1,  
real  DMIN2,  
real  DN,  
real  DNM1,  
real  DNM2,  
logical  IEEE,  
real  EPS  
) 
SLASQ5 computes one dqds transform in pingpong form. Used by sbdsqr and sstegr.
Download SLASQ5 + dependencies [TGZ] [ZIP] [TXT]SLASQ5 computes one dqds transform in pingpong form, one version for IEEE machines another for non IEEE machines.
[in]  I0  I0 is INTEGER First index. 
[in]  N0  N0 is INTEGER Last index. 
[in]  Z  Z is REAL array, dimension ( 4*N ) Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument. 
[in]  PP  PP is INTEGER PP=0 for ping, PP=1 for pong. 
[in]  TAU  TAU is REAL This is the shift. 
[out]  DMIN  DMIN is REAL Minimum value of d. 
[out]  DMIN1  DMIN1 is REAL Minimum value of d, excluding D( N0 ). 
[out]  DMIN2  DMIN2 is REAL Minimum value of d, excluding D( N0 ) and D( N01 ). 
[out]  DN  DN is REAL d(N0), the last value of d. 
[out]  DNM1  DNM1 is REAL d(N01). 
[out]  DNM2  DNM2 is REAL d(N02). 
[in]  IEEE  IEEE is LOGICAL Flag for IEEE or non IEEE arithmetic. 
Definition at line 132 of file slasq5.f.