dlasq6(3) [centos man page]
dlasq6.f(3) LAPACK dlasq6.f(3) NAME
dlasq6.f - SYNOPSIS
Functions/Subroutines subroutine dlasq6 (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2) DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr. Function/Subroutine Documentation subroutine dlasq6 (integerI0, integerN0, double precision, dimension( * )Z, integerPP, double precisionDMIN, double precisionDMIN1, double precisionDMIN2, double precisionDN, double precisionDNM1, double precisionDNM2) DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr. Purpose: DLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow. Parameters: I0 I0 is INTEGER First index. N0 N0 is INTEGER Last index. Z Z is DOUBLE PRECISION array, dimension ( 4*N ) Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument. PP PP is INTEGER PP=0 for ping, PP=1 for pong. DMIN DMIN is DOUBLE PRECISION Minimum value of d. DMIN1 DMIN1 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ). DMIN2 DMIN2 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ) and D( N0-1 ). DN DN is DOUBLE PRECISION d(N0), the last value of d. DNM1 DNM1 is DOUBLE PRECISION d(N0-1). DNM2 DNM2 is DOUBLE PRECISION d(N0-2). Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Definition at line 119 of file dlasq6.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 dlasq6.f(3)
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dlasq5.f(3) LAPACK dlasq5.f(3) NAME
dlasq5.f - SYNOPSIS
Functions/Subroutines subroutine dlasq5 (I0, N0, Z, PP, TAU, SIGMA, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE, EPS) DLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr. Function/Subroutine Documentation subroutine dlasq5 (integerI0, integerN0, double precision, dimension( * )Z, integerPP, double precisionTAU, double precisionSIGMA, double precisionDMIN, double precisionDMIN1, double precisionDMIN2, double precisionDN, double precisionDNM1, double precisionDNM2, logicalIEEE, double precisionEPS) DLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr. Purpose: DLASQ5 computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines. Parameters: I0 I0 is INTEGER First index. N0 N0 is INTEGER Last index. Z Z is DOUBLE PRECISION array, dimension ( 4*N ) Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument. PP PP is INTEGER PP=0 for ping, PP=1 for pong. TAU TAU is DOUBLE PRECISION This is the shift. SIGMA SIGMA is DOUBLE PRECISION This is the accumulated shift up to this step. DMIN DMIN is DOUBLE PRECISION Minimum value of d. DMIN1 DMIN1 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ). DMIN2 DMIN2 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ) and D( N0-1 ). DN DN is DOUBLE PRECISION d(N0), the last value of d. DNM1 DNM1 is DOUBLE PRECISION d(N0-1). DNM2 DNM2 is DOUBLE PRECISION d(N0-2). IEEE IEEE is LOGICAL Flag for IEEE or non IEEE arithmetic. EPS EPS is DOUBLE PRECISION This is the value of epsilon used. Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Definition at line 144 of file dlasq5.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 dlasq5.f(3)