x02am: FL CL CPP AD PY MB

NAG FL Interface
x02amf (real_safe)

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NAG Library Manual, Mark 28.6

Interfaces: FL CL CPP AD PY MB

NAG FL Interface Introduction

X02 (Machine) Chapter Contents

X02 (Machine) Chapter Introduction

x02am: FL CL CPP AD PY MB

▸▿ Contents

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

6 Error Indicators and Warnings

7 Accuracy

8 Parallelism and Performance

9 Further Comments

10 Example

1 Purpose

x02amf returns the safe range of floating-point arithmetic.

2 Specification

Fortran Interface

Function x02amf (

)

Real (Kind=nag_wp)

x02amf

C Header Interface

#include <nag.h>

double

x02amf_ ()

The routine may be called by the names x02amf or nagf_machine_real_safe.

3 Description

x02amf is defined to be the smallest positive model number

z

such that for any

x

in the range [

z, 1 / z

] the following can be computed without undue loss of accuracy, overflow, underflow or other error:

$- x$
$1 / x$
$−1 / x$
$\sqrt{x}$
$\log (x)$
$\exp (\log (x))$
$y^{(\log (x) / \log (y))}$ for any $y$

4 References

None.

5 Arguments

None.

6 Error Indicators and Warnings

None.

7 Accuracy

Not applicable.

8 Parallelism and Performance

Background information to multithreading can be found in the Multithreading documentation.

x02amf is not threaded in any implementation.

9 Further Comments

None.

10 Example

See x02ajf.

NAG Library Manual, Mark 28.6

Interfaces: FL CL CPP AD PY MB

NAG FL Interface Introduction

X02 (Machine) Chapter Contents

X02 (Machine) Chapter Introduction

x02am: FL CL CPP AD PY MB

NAG FL Interfacex02amf (real_​safe)

▸▿ Contents

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

6 Error Indicators and Warnings

7 Accuracy

8 Parallelism and Performance

9 Further Comments

10 Example

NAG FL Interface
x02amf (real_safe)