RRSPACING(3I) Last changed: 1-6-98
NAME
RRSPACING - Returns the reciprocal of the relative spacing of numeric
model numbers near the argument value
SYNOPSIS
RRSPACING ([X=]x)
IMPLEMENTATION
UNICOS, UNICOS/mk, and IRIX systems
STANDARDS
Fortran 90
DESCRIPTION
The RRSPACING intrinsic function returns the reciprocal of the
relative spacing of the numeric real model numbers near the argument
value. For more information on the real number model, see the
MODELS(3I) man page. It accepts the following argument:
x Must be of type real
RRSPACING is an elemental function. The name of this intrinsic cannot
be passed as an argument.
NOTES
This routine is implemented on CRAY T90 systems that support IEEE
arithmetic by calls to scalar-only library routines.
RETURN VALUES
The result type and type parameter are the same as x. The result has
the value
|x multiplied by b**-e | multiplied by b**p, where b, e, and p are
defined in the real number model.
EXAMPLES
The following code was run on several systems:
REAL(KIND=4) r4
REAL(KIND=8) r8
REAL(KIND=16) r16
REAL rd
r4=-3.0_4
r8=-3.0_8
r16=-3.0_16
rd=-3.0
PRINT *,'RRSPACING r4=',RRSPACING(r4)
PRINT *,'RRSPACING r8=',RRSPACING(r8)
PRINT *,'RRSPACING r16=',RRSPACING(r16)
PRINT *,'RRSPACING rd=',RRSPACING(rd)
END
On a CRAY Y-MP E system, the results were as follows:
RRSPACING r4= 12582912.
RRSPACING r8= 105553116266496.
RRSPACING r16= 2.9710560942849126597578981376E+28
RRSPACING rd= 105553116266496.
On an IRIX system, the results were as follows:
RRSPACING r4= 12582912.
RRSPACING r8= 6755399441055744.
RRSPACING r16= 1.216944576219100225436835007716096E+32
RRSPACING rd= 12582912.
On a UNICOS/mk system, the results were as follows:
RRSPACING r4= 12582912.
RRSPACING r8= 6755399441055744.
RRSPACING rd= 6755399441055744.
On a CRAY T90 system that supports IEEE floating-point arithmetic, the
results were as follows:
RRSPACING r4= 12582912.
RRSPACING r8= 6755399441055744.
RRSPACING r16= 7.788445287802241442795744493830144E+33
RRSPACING rd= 6755399441055744.
SEE ALSOMODELS(3I)
Intrinsic Procedures Reference Manual, publication SR-2138, for the
printed version of this man page.
