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Formula Node

Module by: National Instruments. E-mail the author

Summary: In this lesson, you will learn how to use the Formula Node.

Use the Formula Node to perform mathematical operations in the LabVIEW environment. For additional functionality, you can link to the mathematics application MATLAB®.

Formula Node

The Formula Node is a convenient text-based node you can use to perform mathematical operations on the block diagram. Formula Nodes are useful for equations that have many variables or are otherwise complicated and for using existing text-based code. You can copy and paste the existing text-based code into a Formula Node rather than recreating it graphically on the block diagram.

Create the input and output terminals of the Formula Node by right-clicking the border of the node and selecting Add Input or Add Output from the shortcut menu, then enter the variable for the input or output. Type the equation in the structure. Each equation statement must terminate with a semicolon (;).

Formula Nodes also can be used for decision making. The block diagram shown in Figure 1 shows two different ways of using an if-then statement in a Formula Node. The two structures produce the same result.

Figure 1
Figure 1 (formnodeex.png)

The Formula Node can perform many different operations. Refer to the LabVIEW Help for more information about functions, operations, and syntax for the Formula Node.

Note:

The Formula Express VI located on the Functions>>Arithmetic & Comparison palette uses a calculator interface to create mathematical formulas. You can use this Express VI to perform most math functions that a basic scientific calculator can compute. Refer to the LabVIEW Help for more information about the Formula Express VI.

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