SLASQ5(3S)SLASQ5(3S)NAMESLASQ5 - compute one dqds transform in ping-pong form, one version for
IEEE machines another for non IEEE machines
SYNOPSIS
SUBROUTINE SLASQ5( I0, N0, Z, PP, TAU, DMIN, DMIN1, DMIN2, DN, DNM1,
DNM2, IEEE )
LOGICAL IEEE
INTEGER I0, N0, PP
REAL DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, TAU
REAL Z( * )
IMPLEMENTATION
These routines are part of the SCSL Scientific Library and can be loaded
using either the -lscs or the -lscs_mp option. The -lscs_mp option
directs the linker to use the multi-processor version of the library.
When linking to SCSL with -lscs or -lscs_mp, the default integer size is
4 bytes (32 bits). Another version of SCSL is available in which integers
are 8 bytes (64 bits). This version allows the user access to larger
memory sizes and helps when porting legacy Cray codes. It can be loaded
by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
only one of the two versions; 4-byte integer and 8-byte integer library
calls cannot be mixed.
PURPOSESLASQ5 computes one dqds transform in ping-pong form, one version for
IEEE machines another for non IEEE machines.
ARGUMENTS
I0 (input) INTEGER
First index.
N0 (input) INTEGER
Last index.
Z (input) REAL array, dimension ( 4*N )
Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra
argument.
PP (input) INTEGER
PP=0 for ping, PP=1 for pong.
TAU (input) REAL
This is the shift.
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SLASQ5(3S)SLASQ5(3S)
DMIN (output) REAL
Minimum value of d.
DMIN1 (output) REAL Minimum value of d, excluding D( N0 ).
DMIN2 (output) REAL Minimum value of d, excluding D( N0 ) and D(
N0-1 ).
DN (output) REAL
d(N0), the last value of d.
DNM1 (output) REAL
d(N0-1).
DNM2 (output) REAL
d(N0-2).
IEEE (input) LOGICAL
Flag for IEEE or non IEEE arithmetic.
SEE ALSOINTRO_LAPACK(3S), INTRO_SCSL(3S)
This man page is available only online.
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