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Functions

Module by: Eduardo Perez. E-mail the author

Summary: The creation of this content was supported in some part by NSF grant 0538934.

Any G program can become a function. Three operations must be done:

  1. Edit connecting input and/or output terminals
  2. Edit the icon (optional but recommended)
  3. Save the G program

Connectors

Open the Fibonacci.vi for this example.

On the Front Panel window, right click on the icon located on the right upper corner of the window and select Show Connector.

Figure 1: Show Connector Pane
A screen cap of a windows window with a menu present. The item 'show connector'is highlighted.

This brings up the connector pane as shown in Figure 2.

Figure 2: Connector Pane
A screen cap of a windows window showing a 'connector pane'.

Right click on the connector pane and select Patterns. A menu with connector patterns is presented from which you can select the appropriate pattern. For this example select the pattern highlighted in Figure 3.

Figure 3: Select Connector Pattern
A screen cap of a windows window showing a menu with the item 'patterns' highlighted and a row of icon indicating which patterns can be selected for the Connector Pattern.

Click on the connector terminal followed by a click on the input or output control to which the terminal is to be associated. In Figure 4, the left connector terminal is associated with the numeric input control n.

Figure 4: Associating Terminals
A screen cap with the left side of the Connector pane selected and the left field selected.

Repeat for all the input and output controls that are to be associated to the terminals. For the Fibonacci.vi, Figure 5 shows the right connector terminal associated with the Fib(n) output terminal.

Figure 5: Connected Terminals
A screen cap with the left side of the Connector pane light blue and the right side dark blue.

Icon Editor

Right click on the connector pane and select Edit Icon… from the pop-up menu. This will bring the icon editor (Figure 7).

Edit the icon for black and white, 16-color and 256-color displays and click OK when completed.

Save the G program to complete the function.

Figure 6: Selecting Icon Editor
A screen cap of a windows window with a menu on top. The item 'edit icon' is highlighted in the menu.
Figure 7: Icon Editor
An icon editor window.

Invoking Functions

To invoke functions, right click on the Block Diagram window and select Select a VI… from the pop-up menu. This will bring a file dialog box. Find the desired function to be part of the program and click OK.

Figure 8: Invoking Functions
A screencap of the 'Functions' window.

In the example shown in Figure 9, the Fibonacci series of the first 20 Fibonacci numbers is stored in an array. The numbers are computed by invoking the Fibonacci.vi function.

Figure 9: Fibonacci Series
A screencap of the 'Fibonacci Series' function.

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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