how to create 2D array with 3 rows and unlimit column?

[Ray.R]

I added a waveform graph..

Message Edited by JoeLabView on 11-14-2007 08:03 AM

[Ray.R]

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ha noi wrote:

I tried to put 0 at 2nd input. but my graph didn't work. I would like to make X auto scale, and show graph until stop program. In my program, you can see X limited with 50 point. If X >50, the graph doesn't work. I haven't know to fix it.

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You are using Replace Array subset for an array of 3 by 50.  So if you want to go higher than 50, you would have to use the Insert Into array (** insert long story ?? **)

You should also show where the integer is wired to the Replace Array.  It is coming from the top, but I can't see to which terminal it goes to.

[Ray.R]

Similar to before, except using Insert Into Array.  Problem is that it renders using pre-allocated memory useless....

There are many questions that come to mind... one is:  do you need to see the graph while acquiring data?

Message Edited by JoeLabView on 11-14-2007 08:17 AM

[tst]

I just wanted to point out that the size of an array is limited not only by memory but also by a maximum size of 2^31, which is about 2.1 billion elements. Of course, since the smallest element in LabVIEW takes a byte of memory, you will still run out of memory before you reach that limit.

[tst]

It is also considerably more effiecient to resize the array in chunks (e.g. add 1000 columns to the array at once and then replace those until you have no more and then add another 1000) than resize at each iteration.

[Ray.R]

Excellent suggestion tst.

I wasn't sure if the limitation was (2^32)-1 or (2^64)-1 depending on the OS.