Macro for random reshuffle of z-stack

[odellr]

   I'm relatively new to writing macros, and was wondering if anyone has already written an ImajeJ macro which takes a z-stack of 'x' slices, and reshuffles the stack with each slice in a new, random position? Kind of like reshuffling a deck of cards. I know this probably seems very straightforward to experienced programmers, but as I have little-to-no experience in code/macro writing, I'm not sure how to proceed. Any suggestions or pointers would be great.  Thanks!
 
Ryan

[ctrueden]

Hi Ryan,

> was wondering if anyone has already written an ImajeJ macro which
> takes a z-stack of 'x' slices, and reshuffles the stack with each
> slice in a new, random position? Kind of like reshuffling a deck of
> cards.

The most popular algorithm for shuffling is called Fisher-Yates [1].

Fortunately for you there is macro function: Stack.swap(i, j).

 So the implementation is dirty easy:

    for (i = nSlices - 1; i >= 1; i--) {
        j = round(i * random() - 0.5) + 1;
        Stack.swap(i, j);
    }

Regards,
Curtis

[1] https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle



On Tue, Feb 4, 2014 at 10:11 AM, odellr <[hidden email]> wrote:

>    I'm relatively new to writing macros, and was wondering if anyone has
> already written an ImajeJ macro which takes a z-stack of 'x' slices, and
> reshuffles the stack with each slice in a new, random position? Kind of
> like
> reshuffling a deck of cards. I know this probably seems very
> straightforward
> to experienced programmers, but as I have little-to-no experience in
> code/macro writing, I'm not sure how to proceed. Any suggestions or
> pointers
> would be great.  Thanks!
>
> Ryan
>
>
>
> --
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