LabVIEW Tip: Losing your numbers (and references!)

[AustinPeter]

Ever lost your number or more realistically lost a reference when passing through a for loop? Like this…

This one is not obvious! If you are using a auto indexing array into a FOR loop, you may at some stage in your code be passing a zero element array into a FOR loop. This is treated like wiring a zero into the “number of loops” terminal, which, in effect, means the code inside the loop is never processed, but more importantly it means any outputs from the loop revert to their default values. For items that are required in the loop, the best way to get around this is to “shift register” the items into and out of the loop, then it doesn’t get lost!! This is especially important when passing references through loops as you don’t tend to think of these being altered in the loop, but beware that references may get “nulled” if an inadvertent empty array is passed into the loop.

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