NAG Library Routine Document

X02AMF

Note: before using this routine, please read the Users' Note for your implementation to check the interpretation of bold italicised terms and other implementation-dependent details.

+− Contents

1 Purpose

2 Specification

3 Description

4 References

5 Parameters

6 Error Indicators and Warnings

7 Accuracy

8 Further Comments

9 Example

1 Purpose

X02AMF returns the safe range of floating point arithmetic.

2 Specification

FUNCTION X02AMF ( )

REAL (KIND=nag_wp) X02AMF

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 Parameters

None.

6 Error Indicators and Warnings

None.

7 Accuracy

None.

8 Further Comments

None.

9 Example

See Section 9 in X02AJF.

X02AMF (PDF version)

X02 Chapter Contents

X02 Chapter Introduction

NAG Library Manual

NAG Library Routine DocumentX02AMF

+− Contents

1 Purpose

2 Specification

3 Description

4 References

5 Parameters

6 Error Indicators and Warnings

7 Accuracy

8 Further Comments

9 Example

NAG Library Routine Document

X02AMF