Counter for amount of times loop is run

[Aquaphire]

Hello All!

I'm writing a program that requiers the number of times an experiment is run, and in thise case the experiment is in a loop.
meaning that I'd like:

1. date time 0.5556
2. date time 0.4612
3. date time 0.3562


I already have the date time ### part, but I'm not sure how to make something increase.

I was thinking of using the formula node ressembling:

"int32 x,y;
x=0;
y=y+1;
x=y;"

but I'm not sure how it works... Along with not knowing how to wire it to pretty much anything.

Thanks!

[ehudson]

Maybe I don't understand the question, but if the experiment is in a loop, can't you just pull a wire off the "i"?

Eric

[Dennis_Knutson]

A formula node will certainly work but if your experiment is run once per iteration of the loop, then use the loop iteration terminal. That's the little "i" you see in a while and for loop. You can wire an indicator to it. It is zero based (the first iteration is equal to 0) so you can just have a increment function add 1 to that. If the while loop may iterate more times than the experiment may run like if you start the experiment with a Boolean event, then use a shift register and increment the count when the event happens. Attached is a simple example that shows both.

[Aquaphire]

The problem is actually... that I have no "while" or "for" loop.

I have a "case structure loop".

Description: If switch is clicked on : run Program --> "Count: 1"
Else (false) : wait 200 ms



conclusively... there is no "i".. did that clarify anything?

[Aquaphire]

Here's the attached file:

[Will.D]

If I understand what you want to do correctly, I think this should solve your problem...

Geoff

[Dennis_Knutson]

That sure looks like a while loop to me.;) The shift register in my example and Novatron's does the trick.

[Aquaphire]

Ahhh! I've been attacked by the crappiness of labview 6.1... Can't open your file mate.

Could u either take a screenshot of your VI or convert it to 6.1 please...

Thanks 🙂

[Will.D]

Oops, sorry 'bout that. The "False" case just has the two tunnels connected together.

[Dennis_Knutson]

Here's a picture of Novatron's VI. A shift register is a basic element of LabVIEW programming. Most programs use them and they're almost essential to advanced programming.

Message Edited by Dennis Knutson on 06-30-2005 08:30 AM