Java Utililty Methods Vector Add

Map add(List

> vectors)
add

if (vectors == null) {
 throw new IllegalArgumentException("vectors can't be null");
Set<Integer> dimensions = new HashSet<>();
vectors.forEach(d -> dimensions.addAll(d.keySet()));
Map<Integer, Double> composed = new HashMap<>();
dimensions.forEach(d -> {
 double sum = vectors.parallelStream().filter(v -> v.containsKey(d)).mapToDouble(v -> v.get(d))
 .sum();
 composed.put(d, sum);
});
return composed;

void add(Vector left, Vector right)
Adds every element of right to left.

if (right == null) {
 return;
for (int i = 0, n = right.size(); i < n; i++) {
 final Object o = right.elementAt(i);
 left.addElement(o);

Vector Add(Vector V, String S1, String S2, String S3)
Used to create the Vector of attribute keys and corresponding values in one statement.

if (V == null)
 V = new Vector<String[]>();
int n = 1;
if (S1 == null)
 return V;
if (S2 != null)
 n++;
if (S3 != null && S2 != null)
...

void addAll(Vector vector, Object[] copyFrom)
Appends all items from given array after last item of the vector.

if (copyFrom == null) {
 return;
vector.ensureCapacity(vector.size() + copyFrom.length);
for (int i = 0; i < copyFrom.length; i++) {
 vector.addElement(copyFrom[i]);

Vector addArray(Vector vector, Object[] array)
add Array

for (int i = 0; i < array.length; i++) {
 vector.addElement(array[i]);
return vector;

void addToVector(Vector from, Vector to)
add To Vector

if (from != null)
 for (int i = 0; i < from.size(); i++)
 to.addElement(from.elementAt(i));

double[] vectorAdd(double[] v1, double[] v2)
vector Add

if (v1.length != v2.length) {
 throw new IllegalArgumentException("v1.length != v2.length");
double[] res = new double[v1.length];
for (int i = 0; i < v1.length; i++) {
 res[i] = v1[i] + v2[i];
return res;
...

double[] vectorAdd(double[] v1, double[] v2)
Performs vector addition.

double[] result = new double[v1.length];
for (int i = 0; i < result.length; i++) {
 result[i] = v1[i] + v2[i];
return result;

float[] vectorAdd(float[] v1, float[] v2)
Adds to vectors

float[] newVector = new float[3];
newVector[0] = v1[0] + v2[0];
newVector[1] = v1[1] + v2[1];
newVector[2] = v1[2] + v2[2];
return newVector;

void vectorAdd3D(float[] array, int vectorIndex, float x, float y, float z)
This method adds the given 3D vector to the vector specified in the array.

int tempIndex = 3 * vectorIndex;
array[tempIndex] += x;
array[tempIndex + 1] += y;
array[tempIndex + 2] += z;