Storing datas into a 2D array every N cycles

[Edwingtr34]

I am trying to save data together with the index every N cycles,then put them into a 2D array, 

I managed to save the data every N cycles, but I am having some difficulty of saving them with out the zeros in between.

E. g

i      y  save every 3 cycles      i      y

0     0                                    0     0

1    10                                   3    30

2    20                                   6    60

3    30

4    40

5    50

6    60

7    70

8    80

9    90

10  100

Please refer to the attached VI

Thank you

[J-M · Accepted solution]

Try this.

[Edwingtr34]

Thanks JM,

Thats helps a lot !...

Ed

[Edwingtr34]

Hey JM

Sorry to ask you about one more help. Is there any way that I can also limit my 2D array with only the newest 4 obtained data ?

For example that,

when i or the counter = 19, only the index 18, 15, 12, and 9 together with their values are store in the 2d array instead of all of them, as I am trying to used only the newest data for my calculation. 

Thanks again ,if you can help me up with this last doubts that I have. I tried using the delete from array block , but I am still unable to get it working right. sorry to ask you for help again , but I am really new to labview....

[Yamaeda]

Array Subset and Array length can help you achieve that.

/Y

[J-M]

Try this one.

[Edwingtr34]

Hey Guys,

Sorry to post this question here, but this is related to the same VI

Thanks J. W for showing me how to do the delete from array block, that works perfectly fine.

HOWEVER, when I plot the data on the graph, the plots contradict with the values shows in the table, which I really cannot under stand why this is happening. 

Please see attached VI

So sorry to ask this here

Ed

[J-M]

You plot the element 1 of the array data.

[altenbach]

You need to move to index according to the position, here's a quick draft.

[altenbach]

Overall, that constant growing and shrinking of the array is not such a good idea. It causes memory thrashing. Better would be to have a constant sized history buffer. Here's a quick draft. Modify as needed.