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National Instruments
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LabVIEW

Graph Circle VI

Module by: National Instruments

Summary: Plot data using an XY Graph.

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Example 1:	$\frac{\sqrt{\frac{1}{2}}}{\sqrt{{f (x + y)}^{2}}} \frac{\sqrt{1}}{2} 〈 ℝ 〉$	Example 2:		(Hide examples)

Exercise 1

Complete the following steps to build a VI that plots a circle using independent xx and yy arrays.

1.a) Front Panel

Open a blank VI and build the front panel shown in Figure 1.
Figure 1
1. Place an XY Graph, located on the Controls>>All Controls>>Graph palette, on the front panel.
2. Label the graph XY Circle Graph.
3. Change Plot 0 to Circle in the plot legend.
4. Right-click the plot in the plot legend, select Point Style from the shortcut menu, and select the small square.
5. Change the scale labels and ranges, as shown in Figure 1.

1.b) Block Diagram

Build the block diagram shown in Figure 2.
Figure 2
1. Place the Sine & Cosine function, located on the Functions>>Arithmetic & Comparison>>Express Numeric>>Express Trigonometric palette, on the block diagram. This function builds an array of points that represents one cycle of a sine wave and a cosine wave.
2. Place the Bundle function, located on the Functions>>All Functions>>Cluster palette, on the block diagram. This function assembles the sine array and the cosine array to plot the sine array against the cosine array to produce a circle.
3. Place the Pi Multiplied by 2 constant, located on the Functions>>Arithmetic & Comparison>>Express Numeric>>Express Numeric Constants palette, on the block diagram.
Save the VI as Graph Circle.vi in the C:\Exercises\LabVIEW Basics I directory.
Display the front panel and run the VI.
Close the VI.