# Evaluate Polar to Rectangular (Linear Step) (G Dataflow)

Calculates the values of a polar parametric curve in 2D.

To obtain more accurate output values, consider using the Evaluate Polar to Rectangular (Optimal Step) node.  ## number of points

Number of values of the independent variable used in the function calculation.

Default: 10 ## formula

A string representing the formula r = r(phi). 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. ## start

Start value of the interval where this node starts calculating values.

Default: 0 ## end

End value of the interval where this node stops calculating values.

Default: 1 ## 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 ## exclude end

Boolean that specifies whether this node uses the end value of the interval when calculating function values.

 True Does not use the end value when calculating function values. False Uses the end value when calculating function values.

Default: False ## x

An array of the values of the first component, r(phi)cos(phi). ## y

An array of the values of the second component, r(phi)sin(phi). ## 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 function describes a butterfly curve in the plane in polar coordinates:

r(t) = exp(cos(t)) - 2 * cos(4 * t) + sin(t/12)5

You can generate the previous graph by entering the following values on the panel: • number of points: 1000
• formula: exp(cos(t))-2*cos(4*t)+sin(t/12)^5
• start: 0
• end: 30

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

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