2.1.16.6.2.7 exp_integral

Description

Exponential integral E1 (x)

Syntax

double exp_integral( double x )

Parameters

x

[input] the argument x of the function

Return

Returns the value of exponential integral E1 (x)

Examples

EX1

void exp_integral_ex1()
{
	double dx[2]= {2.0,9.0};
	for(int ii = 0; ii<2 ; ii++)
		printf("%lf:	%lf\n",dx[ii],exp_integral(dx[ii]));
}

Remark

See Also

Header to Include

origin.h

Reference