# ExpIntegral

Advanced Analysis Library Only

double ExpIntegral (double x, int n);

## Purpose

Computes the exponential integral function, which is defined as follows:

## Parameters

Input
Name | Type | Description
x | double-precision | The x variable in the exponential integral formula.
n | integer | The n variable in the exponential integral formula.

## Return Value

Name | Type | Description
result | double-precision | The value of the exponential integral function.