void randomPerms(D& arr, randEngine& mtRandom)
{
typedef typename D::iterator iter;
randInt sample(mtRandom, intUniformDist(0,arr.size()-1));
for (iter it=arr.begin(); it!=arr.end(); ++it)
iter_swap(arr.begin()+sample(),it);
} // randomPerms
vectord DiscreteModel::samplePoint()
{
randInt sample(mEngine, intUniformDist(0,mInputSet.size()-1));
return mInputSet[sample()];
};