# Jacobian Elliptic Function (G Dataflow)

Last Modified: August 13, 2019

Determines the Jacobian elliptic function.  ## x

Input argument. If x is negative, the node uses the absolute value of x.

Default: 0 ## k

The integrand parameter. ## error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error  If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error ## cn

Value of the Jacobi elliptic function cn. ## dn

The Jacobi elliptic function dn. ## sn

Value of the Jacobi elliptic function sn. ## phi

The upper limit of the integral defining the function. ## error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error  If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

## Algorithm for Calculating the Jacobian Elliptic Function

The following equations define the Jacobian elliptic function.

$cn\left(x,k\right)=\mathrm{cos}\left(\varphi \right)$
$\mathrm{sn}\left(x,k\right)=\mathrm{sin}\left(\varphi \right)$
$\mathrm{dn}\left(x,k\right)=\sqrt{1-k{\mathrm{sin}}^{2}\varphi }$

where

$x={\int }_{0}^{\varphi }\frac{1}{\sqrt{1-k{\mathrm{sin}}^{2}\theta }}d\theta$

The function is defined according to the following intervals for the input values.

$x\in \Re ,k\in \left[0,1\right]$

For any real value of integrand parameter k in the unit interval, the function is defined for all real values of x.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application