# Evaluate Formula (Single-Variable) (G Dataflow)

Last Modified: January 12, 2018

Calculates one or more function values of a given formula that contains only one variable.

## formula

Function to calculate. The formula can contain only one variable.

Entering Valid Variables

This node accepts variables that use the following format rule: variables must start with a letter or an underscore followed by any number of alphanumeric characters or underscores.

## x value

Value of the variable where this node calculates the function value.

This input accepts the following data types:

• Double-precision, floating-point number
• 1D array of double-precision, floating-point numbers

Default: 0

## 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

## y value

Function value(s) at x value.

This output can return the following data types:

• Double-precision, floating-point number
• 1D array of double-precision, floating-point numbers

## 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.

The following table shows examples of the inputs and outputs of this node.

formula x value y value
x^2 3 9
[1, 2, 3, 4, 5] [1, 4, 9, 16, 25]
x * sin(x) 2.56 1.41

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

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