NAG C Library Function Document

is described in nag_prob_density_landau (g01mtc), using piecewise approximation by rational functions. Further details can be found in Kölbig and Schorr (1984).

To obtain the value of

Φ_{2} (x)

, nag_moment_2_landau (g01qtc) can be used.

4

References

Kölbig K S and Schorr B (1984) A program package for the Landau distribution Comp. Phys. Comm. 31 97–111

5

Arguments

1: $x$ – doubleInput: On entry: the argument $x$ of the function.

6

Error Indicators and Warnings

None.

7

Accuracy

At least

7

significant digits are usually correct, but occasionally only

6

. Such accuracy is normally considered to be adequate for applications in experimental physics.

8

Parallelism and Performance

nag_moment_1_landau (g01ptc) is not threaded in any implementation.

9

Further Comments

None.

10

Example

This example evaluates

Φ_{1} (x)

x = 0.5

, and prints the results.

NAG C Library Function Document

nag_moment_1_landau (g01ptc)

▸▿ 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

10.1 Program Text

10.2 Program Data

10.3 Program Results

1

Purpose

2

Specification

3

Description