NAG CL Interface
X02AJC (precision)

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NAG Library Manual, Mark 28.6

Interfaces: FL CL CPP AD PY MB

NAG CL Interface Introduction

X02 (Machine) Chapter Contents

X02 (Machine) Chapter Introduction

x02aj: 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

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CL Name Style:
Short (a00aac)
Long (impl_details)
Full (nag_info_impl_details)

1 Purpose

X02AJC returns

ε

, the value machine precision.

2 Specification

#include <nag.h>

double

X02AJC

The function may be called by the names: x02ajc or nag_machine_precision.

3 Description

X02AJC is a constant defined in the C Header file.

X02AJC returns machine precision, computed as

ε = \frac{1}{2} \times b^{1 - p}

, where

b

is the arithmetic base (see X02BHC) and

p

is the number of significant base-

b

digits (see X02BJC).

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

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.

X02AJC is not threaded in any implementation.

9 Further Comments

None.

10 Example

None.

NAG Library Manual, Mark 28.6

Interfaces: FL CL CPP AD PY MB

NAG CL Interface Introduction

X02 (Machine) Chapter Contents

X02 (Machine) Chapter Introduction

x02aj: FL CL CPP AD PY MB

NAG CL InterfaceX02AJC (precision)

▸▿ 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 CL Interface
X02AJC (precision)