rearrange array elements

[developer001]

HI

I want to rearrange the elements of an array in a certain order,based on their index.

For example:

Input array A = [1 1 1 1 2 2 2 2 1 1 1 1 2 2 2 2]

Output array B should look like this: B = [1111111122222222]

The values in the array are random, so I cannot search for a "1" or "2".

(I will always have them in blocks of 4)

Thanks!

[camerond]

It looks to me like your example is sorting them by their value, not index. ?

You might want to look at the array function palette.

Spoiler

Sort 1D array

Cameron

[developer001]

No I just put those values to show how I want them sorted.

So the output should have the values of  index 0-3, followed by index 8-11, followed by index 4-7, then index 12-15.

[GerdW]

You might start with a straight-forward approach:

😄

[developer001]

Well I kind of wanted to avoid that!

Is there a more generic solution which I could apply?

[GerdW]

Hi developer,

you asked a specific question and you got a specific answer...

Now you want to have a "generic" answer? What's the generic question here?

Btw. there is a palette full of array functions. You might take a look there and read the help for functions like ArraySubset and ReplaceArrayElements...

[altenbach]

---

@developer001 wrote:

HI

I want to rearrange the elements of an array in a certain order,based on their index.

For example:

Input array A = [1 1 1 1 2 2 2 2 1 1 1 1 2 2 2 2]

Output array B should look like this: B = [1111111122222222]

The values in the array are random, so I cannot search for a "1" or "2".

(I will always have them in blocks of 4)

---

Your description is not specific enough to provide a generic solution. Are there always only two different choices. Is the array lenght always an integer multiple of 8? HOw long is the input array?

What should happen if the input array is [111122221111222211112222]?

What if it is [111122223333111122223333]?

[developer001]

Sorry here is a better description:

The input array is actually 128 elements.

The value of the array is not important, and I dont want to sort based on that. It shouldbe sorted based on the index.There are only 2 cases, so its like I need to switch the order of elements in each block of 4.

Assuming the input has 16 length:

[0][1]...[15]

the output should be in the following order, I used the  [] to show the element at that index:

[0][1][2][3][8][9][10][11][4][5][6][7][12][13][14][15] and so on...

[altenbach]

Let's assume you have a modern LabVIEW version. Here's what you could do.