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NAG Library Routine Document

x02anf (complex_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

1

Purpose

x02anf returns the safe range of complex floating-point arithmetic.

2

Specification

Fortran Interface

Function x02anf (

)

Real (Kind=nag_wp)

x02anf

C Header Interface

#include nagmk26.h

double

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:

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

where

w

is any of

x

i x

x + i x

1 / x

i / x

1 / x + i / x

, and

i

is the square root of

- 1

4

References

None.

5

Arguments

None.

6

Error Indicators and Warnings

None.

7

Accuracy

None.

8

Parallelism and Performance

x02anf is not threaded in any implementation.

9

Further Comments

None.

10

Example

See Section 10 in x02ajf.

x02anf (PDF version)

X02 (machine) Chapter Contents

X02 (machine) Chapter Introduction

NAG Library Manual

NAG Library Routine Document

x02anf (complex_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

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