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.

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:

`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.
Comments:"A full introductory course on programming with LabVIEW."