Function util_getSum

quest/src/core/utilities.cpp:374–388

 */

qreal util_getSum(vector<qreal> list) {

    qreal sum = 0;
    qreal y, t, c=0;
    
    // Kahan summation
    for (auto& x : list) {
        y = x - c;
        t = sum + y;
        c = ( t - sum ) - y;
        sum = t;
    }

    return sum;
}