NAG FL Interface
x02ajf (precision)

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1 Purpose

x02ajf returns ε, the value machine precision.

2 Specification

Fortran Interface
Function x02ajf ( )
Real (Kind=nag_wp) :: x02ajf
C Header Interface
#include <nag.h>
double  x02ajf_ ()
The routine may be called by the names x02ajf or nagf_machine_precision.

3 Description

x02ajf returns machine precision, computed as ε = 12 × b1-p , where b is the arithmetic base (see x02bhf) and p is the number of significant base-b digits (see x02bjf).
It is important to note that the definition of ε here differs from that in ISO Fortran 95 (1997).

4 References

ISO Fortran 95 (1997) ISO Fortran 95 programming language (ISO/IEC 1539–1:1997)

5 Arguments


6 Error Indicators and Warnings


7 Accuracy

Not applicable.

8 Parallelism and Performance

Background information to multithreading can be found in the Multithreading documentation.
x02ajf is not threaded in any implementation.

9 Further Comments


10 Example

This example prints the values of all the functions in Chapter X02. The results will vary from one implementation of the Library to another.

10.1 Program Text

Program Text (x02ajfe.f90)

10.2 Program Data


10.3 Program Results

Program Results (x02ajfe.r)