Why use randVector() to generate randVector, is that possible to use random dataset for P4P verification?

[SheldonHH]

p4p/src/java/p4p/sim/P4PSim.java

Lines 237 to 238 in 2446c44

	////// 1. Generate Data_long_Array && UserVector2 & //////
	data_long_1arr = Util.randVector(dimension, FieldSize_larger_than_bitLength_Sim, l2_norm_double_5dot49_Sim);

p4p/src/java/p4p/util/Util.java

Lines 835 to 880 in 2446c44

	long[] data_Util_randVector = new long[dimension];
	BigInteger bigF_randV = null;
	if(l2_norm_5dot49_Util_randVector <=0){
	bigF_randV = new BigInteger(Long.toString(ZF_orderGroup_utilRandV));
	}
	double myL2_SQUARE_util = 0.;
	int L_10000_util = 10000;
	int[] l2_positive_counter_for_10_dimension = new int[2];
	for(int dimension_id = 0; dimension_id < dimension; dimension_id++) {
	if(l2_norm_5dot49_Util_randVector > 0) {
	data_Util_randVector[dimension_id] = rand.nextInt(2*L_10000_util+1)-L_10000_util;
	myL2_SQUARE_util += (double)((double)data_Util_randVector[dimension_id]*(double)data_Util_randVector[dimension_id]);
	l2_positive_counter_for_10_dimension[0]++;
	}
	else {
	data_Util_randVector[dimension_id] = randomBigInteger(bigF_randV).longValue();
	// A random long in [0, F-1]
	data_Util_randVector[dimension_id] -= Math.floor((double) ZF_orderGroup_utilRandV / 2.);
	// Shift to Z_F
	l2_positive_counter_for_10_dimension[1]++;
	}
	}
	System.out.println("l2_positive_counter_for_10_dimension: " + Arrays.toString(l2_positive_counter_for_10_dimension));
	System.out.println("data_Util_randVector: "+ Arrays.toString(data_Util_randVector));
	if(l2_norm_5dot49_Util_randVector > 0) {
	double myL2_SQRT = Math.sqrt(myL2_SQUARE_util);
	double scale_Util_randV = l2_norm_5dot49_Util_randVector/myL2_SQRT;
	for(int i = 0; i < dimension; i++) {
	long data_half_M_scale = 0;
	long data_ADD_half = (long)(((double)data_Util_randVector[i]+0.5)*scale_Util_randV);
	long data_MINUS_half = (long)(((double)data_Util_randVector[i]-0.5)*scale_Util_randV);
	if(data_Util_randVector[i] > 0) {
	data_half_M_scale = data_ADD_half;
	data_Util_randVector[i] = data_half_M_scale;
	}
	else{
	data_half_M_scale = data_MINUS_half;
	data_Util_randVector[i] = data_half_M_scale;
	}
	// Round to the closest long
	}
	}
	return data_Util_randVector;
	}