X02ANF (PDF version)
X02 Chapter Contents
X02 Chapter Introduction
NAG Library Manual

NAG Library Routine Document

X02ANF

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
    7  Accuracy
    10  Example

1  Purpose

X02ANF returns the safe range of complex floating-point arithmetic.

2  Specification

FUNCTION X02ANF ( )
REAL (KIND=nag_wp) X02ANF

3  Description

X02ANF 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: where w is any of x, ix, x+ix, 1/x, i/x, 1/x+i/x, and i is the square root of -1.

4  References

None.

5  Parameters

None.

6  Error Indicators and Warnings

None.

7  Accuracy

None.

8  Parallelism and Performance

Not applicable.

9  Further Comments

None.

10  Example

See Section 10 in X02AJF.

X02ANF (PDF version)
X02 Chapter Contents
X02 Chapter Introduction
NAG Library Manual

© The Numerical Algorithms Group Ltd, Oxford, UK. 2015