# Evaluate Formula (Multi-Variable Scalar) (G Dataflow)

Calculates one function value based on a given formula that contains multiple variables.

## formula

Formula of n independent variables. The formula can contain any number of valid variables.

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 values

x values corresponding to variables.

## variables

n independent variables of the given formula. variables has a one-to-one relation with x values.

## 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

Calculated function value.

Algorithm for Calculating y value

This node calculates y value using the following equation:

y = f(x1, x2, ..., xn)

where n is the number of independent variables in the given formula.

## 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 an example of the inputs and outputs of this node.

formula x values variables y values
3*x1 + 4*x2 + x3^2 [1, -1, 2] [x1, x2, x3] 3.00

Where This Node Can Run:

Desktop OS: Windows

FPGA: This product does not support FPGA devices