Julien Vincenot

I'm trying to port the Kmeans algorithm to Max.

I found this piece of code and modified in Codeacedemy Labs,

I imported the code and tried to adapt in js object,

js: kmeans_new.js: Javascript TypeError: Groups[newGroup] is undefined, line 91

Problem, both Groups and newGroup variables are defined earlier.

If any js experienced people could take a look and explain

The original code I modified, which works on Codeacademy:

inlets = 2;
outlets = 1;

var str;
var clusts;
var result;

function list() 
{
    if(inlet==0) 
    {
    str = arrayfromargs(arguments);
    outputRes()
    } 
    else if(inlet==1) 
    { 
    clusts = arguments;
    }
}

function kmeans( arrayToProcess, Clusters )
{

  var Groups = [];
  var Centroids = [];
  var oldCentroids = [];
  var changed = false;
  var newGroup = 0; ////////

  // initialise group arrays
  for( initGroups=0; initGroups < Clusters; initGroups++ )
  {

    Groups[initGroups] = [];

  }  

  // pick initial centroids

  initialCentroids=Math.round( arrayToProcess.length/(Clusters+1) );  

  for( i=0; i < Clusters; i++ )
  {

    Centroids[i]=arrayToProcess[ (initialCentroids*(i+1)) ];

  }

  do
  {

    for( j=0; j < Clusters; j++ )
    {

      Groups[j] = [];

    }

    changed=false;

    for( i=0; i < arrayToProcess.length; i++ )
    {

      Distance=-1;
      oldDistance=-1;

        for(j=0;j b[1]) return 1;
        return 0;
    }

    Groups = Groups.sort(Comparator);

    function include(list, atom)
    {
        if (list.length === 0)
        {
            return false;
        }
        else {
            if (list[0] === atom)
            {
                return true;
            }
            else
            {
                return include(list.slice(1), atom);
            }
        }
    }

    class_array = [];

    loop1:
    for (i=0;i


I'm trying to port the Kmeans algorithm to Max.
I found this piece of code and modified in Codeacedemy Labs,
it was doing the trick.

I imported the code and tried to adapt in js object,
I got this error I can't understand. 

If any js experienced people could take a look and explain
to me that would be really helpful.

inlets = 2;
outlets = 1;

var str;
var clusts;
var result;

function list() 
{
	if(inlet==0) 
	{
	str = arrayfromargs(arguments);
	outputRes()
	} 
	else if(inlet==1) 
	{ 
	clusts = arguments;
	}
}

function kmeans( arrayToProcess, Clusters )
{

  var Groups = [];
  var Centroids = [];
  var oldCentroids = [];
  var changed = false;
  var newGroup = 0; ////////

  // initialise group arrays
  for( initGroups=0; initGroups < Clusters; initGroups++ )
  {

    Groups[initGroups] = [];

  }  

  // pick initial centroids

  initialCentroids=Math.round( arrayToProcess.length/(Clusters+1) );  

  for( i=0; i < Clusters; i++ )
  {

    Centroids[i]=arrayToProcess[ (initialCentroids*(i+1)) ];

  }

  do
  {

    for( j=0; j < Clusters; j++ )
    {

      Groups[j] = [];

	}

    changed=false;

	for( i=0; i < arrayToProcess.length; i++ )
	{

	  Distance=-1;
	  oldDistance=-1;

        for(j=0;j b[1]) return 1;
        return 0;
    }

    Groups = Groups.sort(Comparator);

    function include(list, atom)
    {
        if (list.length === 0)
        {
            return false;
        }
        else {
            if (list[0] === atom)
            {
                return true;
            }
            else
            {
                return include(list.slice(1), atom);
            }
        }
    }

    class_array = [];

    loop1:
    for (i=0;i


js-kmeans-algorithm-variable-error-i-cannot-explain

I was not taking input 1 as an array like input 0, even if I just needed an integer.

So to make it work just change :
clusts = arguments;
to
clusts = arrayfromargs(arguments);

function outputRes()
{
outlet(0, kmeans(str, clusts[0]));
}


hmm, any explanation about using this js ? thanks

The js object with this code (modified according to my last message) has 2 inputs :

the first being a list of data of one dimension evolving through time,

If you trigger the second (let's say 3 categories), then a list to the first input,

the data will be automatically categorized into these 3 categories.

I cannot give much more explanation since I "stole" the code somewhere on the internet... ;)

The js object with this code (modified according to my last message) has 2 inputs :
the first being a list of data of one dimension evolving through time,
the second is an amount of categories.
If you trigger the second (let's say 3 categories), then a list to the first input,
the data will be automatically categorized into these 3 categories.

JS : Kmeans algorithm / variable error I cannot explain