Function cdf

src/traces/histogram/calc.js:540–586

(size, direction, currentBin)

}

function cdf(size, direction, currentBin) {
    var i, vi, prevSum;

    function firstHalfPoint(i) {
        prevSum = size[i];
        size[i] /= 2;
    }

    function nextHalfPoint(i) {
        vi = size[i];
        size[i] = prevSum + vi / 2;
        prevSum += vi;
    }

    if(currentBin === 'half') {
        if(direction === 'increasing') {
            firstHalfPoint(0);
            for(i = 1; i < size.length; i++) {
                nextHalfPoint(i);
            }
        } else {
            firstHalfPoint(size.length - 1);
            for(i = size.length - 2; i >= 0; i--) {
                nextHalfPoint(i);
            }
        }
    } else if(direction === 'increasing') {
        for(i = 1; i < size.length; i++) {
            size[i] += size[i - 1];
        }

        // 'exclude' is identical to 'include' just shifted one bin over
        if(currentBin === 'exclude') {
            size.unshift(0);
            size.pop();
        }
    } else {
        for(i = size.length - 2; i >= 0; i--) {
            size[i] += size[i + 1];
        }

        if(currentBin === 'exclude') {
            size.push(0);
            size.shift();
        }
    }
}

module.exports = {
    calc: calc,