Gianni Leone

I'm trying to create something that will allow me to find the position of duplicate numbers within a list. List size is always 6. for instance if presented with the list 2 5 4 7 4 1, I should get the output 3 and 5 for the position of the list where duplicates are found. I've tried using many combinations of zl. objects but I am a beginner and cant seem to figure anything out.

I'm trying to create something that will allow me to find the position of duplicate numbers within a list. List size is always 6. for instance if presented with the list  2 5 4 7 4 1, I should get the output 3 and 5 for the position of the list where duplicates are found. I've tried using many combinations of zl. objects but I am a beginner and cant seem to figure anything out.

Hello all,
I'm trying to create something that will allow me to find the position of duplicate numbers within a list. List size is always 6.

filter-out-list-duplicates-then-report-duplicate-positions-within-list

some things are too hard to do with zl objects-- best to use javascript.

copy the code below, save it as a text file named positionsOfDuplicates.js

function list(){
    var positions = new Array();
    var output = new Array();
    input = arrayfromargs(arguments);
    var length = arguments.length;

    for (i=0; i<length-1; i++)
    {
        for (j=i+1;  j<length; j++)
        {
            if(input[i]==input[j])
            {
                positions.push(i);
                positions.push(j);
            }
        }
    }
    output= unique(positions)
    outlet(0,output);
}

//remove duplicate positions
function unique(a) {
    return a.sort().filter(function(item, pos, ary) {
        return !pos || item != ary[pos - 1];
    })
}





Put the js file in your max file path then use this example patch:

some things are too hard to do with zl objects-- best to use javascript.
copy the code below, save it as a text file named positionsOfDuplicates.js

function list(){
	var positions = new Array();
	var output = new Array();
	input = arrayfromargs(arguments);
	var length = arguments.length;

	for (i=0; i<length-1; i++)
	{
		for (j=i+1;  j<length; j++)
		{
			if(input[i]==input[j])
			{
				positions.push(i);
				positions.push(j);
			}
		}
	}
	output= unique(positions)
	outlet(0,output);
}

//remove duplicate positions
function unique(a) {
    return a.sort().filter(function(item, pos, ary) {
        return !pos || item != ary[pos - 1];
    })
}





Put the js file in your max file path then use this example patch:

Hey thanks so much that method works great. I actually ended up making my own method with just max objects. I've attached it bellow.

Number Repetition Finder.maxpat

well done! (but i'm not really sure of the actual logic, but I noticed it only works for repetitions of a single number). good if it suits your purposes, but just for the record I added a zl group to the end so all positions are captured.

well done! (but i'm not really sure of the actual logic, but I noticed it only works for repetitions of a single number).  good if it suits your purposes, but just for the record I added a zl group to the end so all positions are captured.


made this thing playing around the question, coll is my friend...:

Filter out list duplicates, then report duplicate positions within list.