How to calculate the Mode

Dalmazzo

Hi all

I have a number coming from wekinator that is detecting 5 different patterns. Wekinator as an output gives a number fluctuating from 1 o 5.

How can I know the Mode if this number in Max? I need to know what is the most repeated number in a row of 15 values.

Roman Thilenius

t b i

route 1 2 3 4 5

and then counter or accum?

Dalmazzo

Hi Roman

I need it to run in realtime, something more close to [zl.group 15] and then [zl.median] but instead of median I need Mode.

double_UG

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Dalmazzo

I resolve it with js 
Does someone have a better solution? 

var myval=0;

if (jsarguments.length>1)
    myval = jsarguments[1];

function mode(numbers) {
    // as result can be bimodal or multi-modal,
    // the returned result is provided as an array
    var modes = [], count = [], i, number, maxIndex = 0;
 
    for (i = 0; i < numbers.length; i += 1) {
        number = numbers[i];
        count[number] = (count[number] || 0) + 1;
        if (count[number] > maxIndex) {
            maxIndex = count[number];
        }
    }

    for (i in count)
        if (count.hasOwnProperty(i)) {
            if (count[i] === maxIndex) {
                modes.push(Number(i));
            }
        }
    if(modes.length <= 1) modes.push(-1);
    return modes;
}

function list()
{
    var a = arrayfromargs(arguments);
    //post("received list " + a + "\n");
    myval = mode(a);
    bang();
}

function bang()
{
    outlet(0,myval);
}

Peter McCulloch

The javascript will work, but if you want an all-max solution you might look at histo (example below). Also, I posted code several weeks back for a time-based histogram (where entries expire after X ms) if you're interested.

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Dalmazzo

Hi Peter

Very nice how you resolve it on [p ZL_version]. Thanks!