1D array not populating

[csk]

In this example,

If I leave the index input open in the Insert Into Array VI, my

first record gets placed.

If I tie the index value to the current fetch record being processed,

the array does not populate.

My input stream is 30,000 records, multi-fetched 150 times for a total array

size of 4500000 elements.

Thanx

[Anil_Reddy]

Hi,

can u save ur example in 8.5.1 and repost it.......

did u try shift registers?

[altenbach]

I cannot run your example, because I don't have your hardware, but why don't you simply use "built array" in concatenate mode? No index necessary!

You also need a shift register or feedback node to retain the growing array. At the moment you are constantly appending to the empty array from the input tunnel. 

Since you know the exact size of the final array from the beginning, it would be much more memory efficient of you would initialize the array at the final size and then use "replace array subset" to fill in the data. 

Message Edited by altenbach on 12-23-2008 10:01 AM

[csk]

Here is the example in LV8.5

I will admit, the shift register method is not

sitting with me yet. I do need the fastest

method, since I plan on taking multiple 'frames'

of data back to back.

Thankyou

Jeez, I am having problems backreving the VI.

I just updated to 8.6 yesterin.

[Anil_Reddy]

here you are over writing the Output array....... and you are always inserting data into an empty array. this is the reason, array does not populate.

even if you want to take multiple frames of data back to back, you can use shift register with build array function..right???

[altenbach]

As I said, you need to familiarize yourself with dataflow. Here's the quick solution (not memory efficient) that uses a shift register and built array (concatenate mode) to grow the array.

Message Edited by altenbach on 12-23-2008 12:56 PM

[altenbach · Accepted solution]

An here's the more memory efficient way, allocating the full array once and fill in real data as you go.

Message Edited by altenbach on 12-23-2008 01:02 PM

[csk]

Thankyou again.

The way I am pulling data from the PXI-5122 digitizer is slow.

Its a multi-fetch method and reading the individual records (150 total, 30,000 elements ea)

takes a huge amount of time. Not sure that can be sped up.

I have an example running now capturing data into one large array that I will later

merge with the parsing routine you helped me develop.

This was the front end digitzer part. Later I will add the imaging display.

Thank you again and Happy Holidays.

-Chester

[KB29]

Hi,

I need to insert a 1D array into a 2D array. 2D array is initialized as 0. I need to update the data from 1D array as every row of 2D array.

My 1D array consists of 1 row and 4 columns. 1 data/time string and 3 other strings.

I need to update the 2d array every second when the time stamp runs.i.e. 00:00:01 should be 1st row of 2D array & 00:00:02 should be 2nd row of 2D array.

Pls let me know any ideas.

Thanks

KB29

[GerdW]

Hi kb,

you should have created a new thread for your question...

Idea: use InsertIntoArray!

One more idea: attach a VI to show us your own attempts on this problem...