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NAG[s13adc] NAG[nag_sin_integral] - Sine integral

Calling Sequence

s13adc(x)

nag_sin_integral(. . .)

Parameters

x - float;

On entry: the argument of the function.

Description

	Purpose
	nag_sin_integral (s13adc) returns the value of the sine integral .

	Description
	nag_sin_integral (s13adc) evaluates The approximation is based on several Chebyshev expansions.

Error Indicators and Warnings

None.

Accuracy

If and are the relative errors in the argument and result, respectively, then in principle . The equality may hold if is greater than the machine precision ( due to data errors etc.), but if is simply due to round-off in the machine representation, then since the factor relating to is always less than one, the accuracy will be limited by machine precision.

For , where is a machine-dependent value, to within machine precision.

	Further Comments
	None.

Examples

>	x := 0: NAG:-s13adc(x);

	See Also
	Abramowitz M and Stegun I A (1972) Handbook of Mathematical Functions (3rd Edition) Dover Publications s Chapter Introduction. NAG Toolbox Overview. NAG Web Site.