For Loop runs with unwired N value

[PauldePaor]

In what cases will a for loop run with no N value wired to the loop? I've seen a couple of examples of the for loop running without a number of times set to be ran wired to it or for example an array size or something like that.

[Norbert_B]

Auto-indexing input tunnel.

Please refer to the LabVIEW help for detailed information on this.

Norbert

[jcarmody]

It'll run if there's an array wired in; once for each element in the array.

[crossrulz]

The number of times a FOR loop runs is the minimum of what is wired to the N terminal and the size of the smallest array that is autoindexing into it.

So if you have two arrays autoindexing into a FOR loop, one having 3 elements and the other having 5, the loop will iterate 3 times.  If you wire a 10 to N, it will still only iterate 3 times.  If you wire a 2 to the N, then it will only run twice.  Clear as mud?

[PauldePaor]

Below is a program I am working on and as you can see by the image that the program runs without the N loop being wired. The program runs with no issue

[_Bryan]

Why not post an image of the entire for for loop?  It seems you are stuck on the N being wired, but as others pointed out the N terminal is not the only control for how many iterations the loop runs.  Try posting a complete image if you are looking for help.

[MrHappyAsthma · Accepted solution]

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@PauldePaor wrote:

Below is a program I am working on and as you can see by the image that the program runs without the N loop being wired. The program runs with no issue

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As everyone else has been saying, you DO NOT have to wire something to N.  If you wire an array to the for-loop as an "auto-index" input, the for-loop will automatically run for the size of the smallest array.

Perhaps an example will help:

This loops over the size of my array (in this case, 5 elements long).  The symbol on the edge of the for-loop that looks like brackets [ ], indicates that it is auto-indexed.  The loop will iterate over each element one at a time (1, then 2, then 3, then 4, then 5).