ieeeck.f(3) LAPACK ieeeck.f(3)NAME
ieeeck.f -
SYNOPSIS
Functions/Subroutines
INTEGER function ieeeck (ISPEC, ZERO, ONE)
IEEECK
Function/Subroutine Documentation
INTEGER function ieeeck (integerISPEC, realZERO, realONE)
IEEECK
Purpose:
IEEECK is called from the ILAENV to verify that Infinity and
possibly NaN arithmetic is safe (i.e. will not trap).
Parameters:
ISPEC
ISPEC is INTEGER
Specifies whether to test just for inifinity arithmetic
or whether to test for infinity and NaN arithmetic.
= 0: Verify infinity arithmetic only.
= 1: Verify infinity and NaN arithmetic.
ZERO
ZERO is REAL
Must contain the value 0.0
This is passed to prevent the compiler from optimizing
away this code.
ONE
ONE is REAL
Must contain the value 1.0
This is passed to prevent the compiler from optimizing
away this code.
RETURN VALUE: INTEGER
= 0: Arithmetic failed to produce the correct answers
= 1: Arithmetic produced the correct answers
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 83 of file ieeeck.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 ieeeck.f(3)
Check Out this Related Man Page
slasq5.f(3) LAPACK slasq5.f(3)NAME
slasq5.f -
SYNOPSIS
Functions/Subroutines
subroutine slasq5 (I0, N0, Z, PP, TAU, SIGMA, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE, EPS)
SLASQ5
Function/Subroutine Documentation
subroutine slasq5 (integerI0, integerN0, real, dimension( * )Z, integerPP, realTAU, realSIGMA, realDMIN, realDMIN1, realDMIN2, realDN,
realDNM1, realDNM2, logicalIEEE, realEPS)
SLASQ5
Purpose:
SLASQ5 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 REAL 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 REAL
This is the shift.
DMIN
DMIN is REAL
Minimum value of d.
DMIN1
DMIN1 is REAL
Minimum value of d, excluding D( N0 ).
DMIN2
DMIN2 is REAL
Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN
DN is REAL
d(N0), the last value of d.
DNM1
DNM1 is REAL
d(N0-1).
DNM2
DNM2 is REAL
d(N0-2).
IEEE
IEEE is LOGICAL
Flag for IEEE or non IEEE arithmetic.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
April 2012
Definition at line 132 of file slasq5.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.1 Sun May 26 2013 slasq5.f(3)
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