NAG C Library Function Document

nag_bessel_k_nu_scaled (s18edc)

1

Purpose

2

Specification

3

Description

4

References

5

Arguments

1:    $\mathbf{x}$ – doubleInput

On entry: the argument $x$ of the function.

Constraint: $\mathbf{x}>0.0$.

2:    $\mathbf{nu}$ – IntegerInput

On entry: the argument $\nu$ of the function.

Constraint: $1\le \mathrm{abs}\left(\mathbf{nu}\right)\le 3$.

3:    $\mathbf{fail}$ – NagError *Input/Output

The NAG error argument (see Section 3.7 in How to Use the NAG Library and its Documentation).

6

Error Indicators and Warnings

NE_INT

On entry, $\mathbf{nu}=〈\mathit{\text{value}}〉$.
Constraint: $1\le \mathrm{abs}\left(\mathbf{nu}\right)\le 3$.

NE_INTERNAL_ERROR

An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.

NE_OVERFLOW_LIKELY

The evaluation has been abandoned due to the likelihood of overflow. The result is returned as zero.

NE_REAL

On entry, $\mathbf{x}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{x}>0.0$.

NE_TERMINATION_FAILURE

The evaluation has been abandoned due to failure to satisfy the termination condition. The result is returned as zero.

NE_TOTAL_PRECISION_LOSS

The evaluation has been abandoned due to total loss of precision. The result is returned as zero.

NW_SOME_PRECISION_LOSS

The evaluation has been completed but some precision has been lost.

7

Accuracy

8

Parallelism and Performance

9

Further Comments

10

Example

10.1

Program Text

Program Text (s18edce.c)

10.2

Program Data

Program Data (s18edce.d)

10.3

Program Results

Program Results (s18edce.r)