# Exponential Integral (G Dataflow)

Version:

Computes the exponential integral function.

## x

The input argument.

Default: 0

## n

The exponent parameter.

## error in

Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

Default: No error

## En(x)

Value of the exponential integral function.

## error out

Error information. The node produces this output according to standard error behavior.

## Algorithm for Computing the Exponential Integral Function

The following equation defines the exponential integral function.

$E\left(x,n\right)={\int }_{1}^{\infty }{t}^{-n}{e}^{-xt}dt$

The following intervals for the input values define the exponential integral function.

$n\in \left\{0,1,2,...\right\},\text{\hspace{0.17em}}x\in \left[0,\infty \right)$

This node supports the entire domain of this function that produces real-valued results. For any nonnegative integer value of order n, the function is defined for nonnegative real values of x.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported