Function getRandomSubRange

tests/utils/random.cpp:146–157

vector<int> getRandomSubRange(int start, int endExcl, int numElems) {
    DEMAND( endExcl >= start );
    DEMAND( numElems >= 1 );
    DEMAND( numElems <= endExcl - start );

    // shuffle entire range (advances RNG on every node, identically)
    vector<int> range = getRange(start, endExcl);
    std::shuffle(range.begin(), range.end(), RNG);
    
    // return first subrange
    return vector<int>(range.begin(), range.begin() + numElems);
}


vector<qreal> getRandomProbabilities(int numProbs) {