topic Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created. in LabVIEW

How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 16:05:55 GMT

I tried many ways so far.

I know that I can use build array to create an array from two numbers but Im not able to create a 2d array that way

I also tried using Replace array subset but still it wont work.

I know that I have to use an array function that has column index starting at 0 so whenever I press the button the column index incriments by 1 so the next column will change but Im not able to create this.

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

ijustlovemath — Thu, 08 Oct 2015 16:17:30 GMT

You want it to add to your current array? Here's a good way using an event structure:

edit: Attached the VI for OP

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 16:18:33 GMT

Here's a screenshot to explain myself better.

In this case however, whever In press the button the first column is replaced.

I want to change the next column whenever I press "next point".

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

ijustlovemath — Thu, 08 Oct 2015 16:18:59 GMT

Download the VI attached to my previous post and try it out! I think it does what you want.

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 16:21:46 GMT

Greatly appreciated 🙂

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

ijustlovemath — Thu, 08 Oct 2015 16:23:03 GMT

No problem! You may want to mark my first post as the solution instead, for future generation's benefit 😄

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 16:24:06 GMT

Fixed it 🙂 sorry still new to the forum

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

ijustlovemath — Thu, 08 Oct 2015 16:25:00 GMT

No worries! Welcome to LV!

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

altenbach — Thu, 08 Oct 2015 16:32:12 GMT

@ijustlovemath wrote:

You want it to add to your current array? Here's a good way using an event structure:

I don't understand the purpose of the timeout case. All it does burn CPU cyclces as fast as the computer allows, constantly writing the same stuff to the array indicator. remove it.
If you would wire the array indicator before the event structure, it would reset correctly at the beginning of the program. Now you can even use the same event for stop and add, because nothing gets appended to the indicator when you stop. Only one event case needed overall, simplifying the code.
It would be much simpler and efficient to add rows instead of columns. Adding columns is expensive in terms of memory management.
If the final array size were known, things could be made significanttly more efficient.

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

ijustlovemath — Thu, 08 Oct 2015 16:34:32 GMT

You're the authority on this one Altenbach! Writing this one, I just made it to have it work. Didn't really consider all of that. Here's a modified version for the OP to use should he like:

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

altenbach — Thu, 08 Oct 2015 16:40:30 GMT

Here's my version 😄

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

altenbach — Thu, 08 Oct 2015 16:47:02 GMT

As I said, Adding rows (instead of columns) is significantly more simple and efficient, because the existing elements remain in memory order. Maybe the original problem can be reformulated. We can always transpose at the end if needed.

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 16:52:21 GMT

And here's my modified version. 🙂

I used the case structure since I understand it better than the event structure. It'll be easier for me to modify or work on it later.

Anyway Thanks for your solutions 🙂

What are ur opinions on my version?

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 16:59:54 GMT

Ok so I just realized that in my case its also continuously running the false case.. So I think I'll just stick with the event structure

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

altenbach — Thu, 08 Oct 2015 17:00:20 GMT

What happens in the false case? (Sorry posting by phone).
What determines the loop rate?

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 17:04:07 GMT

It does the same job as the timeout case previously which will waste CPU

here's a screenshot

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 17:06:48 GMT

I just checked the CPU

In your case only 2% is being used whereas in mine it reaches 20%

Thanks for your help!

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

altenbach — Thu, 08 Oct 2015 17:09:56 GMT

OK, you are basically burning 100% of one cpu core doing absolutely nothing useful. 🙂

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

ijustlovemath — Thu, 08 Oct 2015 17:51:58 GMT

Patomated,

Sixclear has a great video describing what the event structure is, located here.

Re: How can I build an array using two numeric controls and a button? Whenever I press the button a column of 2 rows (the numeric controls) should be created.

patomated — Thu, 08 Oct 2015 18:31:30 GMT

Thank you!!!