split 2 D-Array

[Simon790]

Hello I nedd to split an 2D-Array in the following way into 2 Arrays.

1  2   3   4   5   6   7   8

9 10 11 12 13 14 15 16

....

into

1  2   5   6

9 10 13 14

...

and

3   4   7   8

11 12 15 16

...

like interleaving  pairs of columns.

The idea is that i can take the difference of values which have a row inbetween. (1-3, 2-4, 5-7 ect.)

I can achieve that if i can generate this two arrays out of one and then substract them from each other.

Or does someone have a better idea for this? 

thx

Simon

[GerdW]

Hi Simon,

two solutions come to my mind, but both need to build up new arrays.

1) You can index all rows and decimate them. Build up new arrays from the decimated ones.

2) Index trough your columns and subtract the appropriate columns. Then build up a new array from the resulting ones.

I would prefer solution 2. Solution 1 has to option to give you the decimated arrays too in case you need them.

[dan_u]

Or use the rotate 1D array function in a loop. See attached picture. Be aware that if you rotate the array by 2, the last 2 columns in the difference array are invalid.