drotmg(3) [centos man page]
drotmg.f(3) LAPACK drotmg.f(3) NAME
drotmg.f - SYNOPSIS
Functions/Subroutines subroutine drotmg (DD1, DD2, DX1, DY1, DPARAM) DROTMG Function/Subroutine Documentation subroutine drotmg (double precisionDD1, double precisionDD2, double precisionDX1, double precisionDY1, double precision, dimension(5)DPARAM) DROTMG Purpose: CONSTRUCT THE MODIFIED GIVENS TRANSFORMATION MATRIX H WHICH ZEROS THE SECOND COMPONENT OF THE 2-VECTOR (DSQRT(DD1)*DX1,DSQRT(DD2)*> DY2)**T. WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS.. DFLAG=-1.D0 DFLAG=0.D0 DFLAG=1.D0 DFLAG=-2.D0 (DH11 DH12) (1.D0 DH12) (DH11 1.D0) (1.D0 0.D0) H=( ) ( ) ( ) ( ) (DH21 DH22), (DH21 1.D0), (-1.D0 DH22), (0.D0 1.D0). LOCATIONS 2-4 OF DPARAM CONTAIN DH11, DH21, DH12, AND DH22 RESPECTIVELY. (VALUES OF 1.D0, -1.D0, OR 0.D0 IMPLIED BY THE VALUE OF DPARAM(1) ARE NOT STORED IN DPARAM.) THE VALUES OF GAMSQ AND RGAMSQ SET IN THE DATA STATEMENT MAY BE INEXACT. THIS IS OK AS THEY ARE ONLY USED FOR TESTING THE SIZE OF DD1 AND DD2. ALL ACTUAL SCALING OF DATA IS DONE USING GAM. Parameters: DD1 DD1 is DOUBLE PRECISION DD2 DD2 is DOUBLE PRECISION DX1 DX1 is DOUBLE PRECISION DY1 DY1 is DOUBLE PRECISION DPARAM DPARAM is DOUBLE PRECISION array, dimension 5 DPARAM(1)=DFLAG DPARAM(2)=DH11 DPARAM(3)=DH21 DPARAM(4)=DH12 DPARAM(5)=DH22 Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: November 2011 Definition at line 91 of file drotmg.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 drotmg.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 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 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: April 2012 Definition at line 144 of file dlasq5.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.1 Sun May 26 2013 dlasq5.f(3)