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Array Exercise VI

Module by: National Instruments. E-mail the author

Summary: Create arrays and become familiar with the Array functions.

Exercise 1

Complete the following steps to build a VI that creates an array of random numbers, scales the resulting array, and takes a subset of that final array.

1.a) Front Panel

  1. Open a blank VI and build the front panel shown in Figure 1.
    Figure 1
    Figure 1 (arrex.png)
    1. Place an array, located on the Controls>>All Controls>>Array & Cluster palette, on the front panel.
    2. Label the array Random Array.
    3. Place a numeric indicator, located on the Controls>>Numeric Indicators palette, in the array shell.
    4. Use the Positioning tool to resize the array control to contain 1010 numeric indicators.
    5. Press the <Ctrl> key while you click and drag the Random Array control to create two copies of the control.
    6. Label the copies Final Array and Subset Array.
    7. Place three numeric controls, located on the Controls>>Numeric Controls palette, and label them Scaling Factor, Start Subset, and # of Elements.
    8. Right-click the Start Subset and # of Elements controls and select Representation>>I32 from the shortcut menu.
    9. Do not change the values of the front panel controls.

1.b) Block Diagram

  1. Build the block diagram shown in Figure 2.
    Figure 2
    Figure 2 (arrexbd.png)
    1. randnum.png Place the Random Number (0-1) function, located on the Functions>>Arithmetic & Comparison>>Express Numeric palette, on the block diagram. This function generates a random number between 00 and 11.
    2. forloop.png Place the For Loop, located on the Functions>>All Functions>>Structures palette, on the block diagram. The loop accumulates an array of 1010 random numbers at the output tunnel. Create a constant of 1010 for the count terminal.
    3. multiply.png Place the Multiply function, located on the Functions>>Arithmetic & Comparison>>Express Numeric palette, on the block diagram. In this exercise this function multiplies Random Array by Scaling Factor and returns Final Array.
    4. ArraySubset.png Place the Array Subset function, located on the Functions>>All Functions>>Array palette, on the block diagram. This function returns a portion of an array starting at Start Subset and containing # of Elements elements.
  2. Save the VI as Array Exercise.vi in the C:\Exercises\ LabVIEW Basics I directory.

1.c) Run the VI

  1. Display the front panel, change the values of the controls, and run the VI a few times. The For Loop runs for 1010 iterations. Each iteration generates a random number and stores it at the output tunnel. Random Array displays an array of 1010 random numbers. The VI multiplies each value in Random Array by Scaling Factor to create Final Array. The VI takes a subset of Final Array starting at Start Subset for # of Elements and displays the subset in Subset Array.
  2. Close the VI.

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