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Formula Node Exercise VI

Module by: National Instruments. E-mail the author

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Summary: In this exercise, the objective is to use the Formula Node in a VI. Complete the following steps to build a VI that uses the Formula Node to perform a complex mathematical operation and graphs the results.

Note: Your browser may not currently support MathML. See our browser support page for additional details. You can always view the correct math in the PDF version.

Exercise 1

1.a) Front Panel

  1. Open a blank VI and build the front panel shown in Figure 1.
    Figure 1
    Figure 1 (formulaexer.png)

1.b) Block Diagram

  1. Build the block diagram shown in Figure 2.
    Figure 2
    Figure 2 (formulaexerbd.png)
    1. Place the Formula Node, located on the Functions>>All Functions>>Structures palette, on the block diagram.
    2. Create the x input terminal by right-clicking the left border and selecting Add Input from the shortcut menu. Type x in the box that appears.
    3. Create the y and a output terminals by right-clicking the right border and selecting Add Output from the shortcut menu. Enter y and a, respectively, in the boxes that appear. You must create output terminals for temporary variables like aa.

      Note:

      When you create an input or output terminal, you must use a variable name that exactly matches the one in the equation. Variable names are case sensitive.
    4. Type the following equations in the Formula Node, where ** is the exponentiation operator. Refer to the LabVIEW Help for more information about syntax for the Formula Node. 
      
		    a = tanh(x) + cos(x);
		    y = a**3 + a;
    5. Complete the block diagram as shown in Figure 2.
  2. Save the VI as Formula Node Exercise.vi in the C:\Exercises\ LabVIEW Basics I directory.

1.c) Run the VI

  1. Display the front panel and run the VI. The graph displays the plot of the equation y=f3x+fx y f x 3 f x , where fx=tanhx+cosx f x x x . During each iteration, the VI divides the iteration terminal value by 15.0. The quotient is wired to the Formula Node, which calculates the function value. The VI plots the array as a graph.
  2. Close the VI.

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