National Instruments BridgeVIEW

Chapter 14 Arrays, Clusters, and Graphs

Bundle function (Functions»Cluster)—Assembles the plot

components into a cluster. You need to resize the Bundle function icon

before you can wire it properly. Place the Positioning tool on the

lower-left corner of the icon. The tool transforms into the Resizing

cursor shown at left. When the tool changes, click and drag down until

a third input terminal appears. Now,you can continue wiring your

block diagram as shown in the previous illustration.

Numeric Constant (Functions»Numeric)—Three numeric constants

set the number of For Loop iterations, the initial X value, and the delta

X value. Notice that you can pop up on the For Loop count terminal,

shown at left, and select Create Constant to add and wire a numeric

constant for that terminal automatically.

10. From the front panel, run the VI. The VI plots the auto-indexed

waveform array on the waveform graph. The initial X value is 0 and the

delta X value is 1.

11. Change the delta X value to 0.5 and the initial X value to 20. Run the

VI again.

Notice that the graph now displays the same 100 points of data with a

starting value of 20 and a delta X of 0.5 for each point (see the X axis).

In a timed test, this graph might correspond to 50 seconds worth of

data starting at 20 seconds.

12. You can view any element in the waveform array by entering the index

of that element in the index display. If you enter a number greater than

the array size, the display dims, indicating that you do not have a

defined element for that index.

If you want to view more than one element at a time, you can resize the

array indicator. Place the Positioning tool on the lower right corner of

the array. The tool transforms into the array Resizing cursor shown at

left. When the tool changes, drag to the right or straight down. The

array now displays several elements in ascending index order,

beginning with the element corresponding to the specified index, as the

following illustration shows.

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index index