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DenseDoubleVector.java
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DenseDoubleVector.java
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/*=============================================================================
| Assignment: Final Project - Multiple Document Summarization
| Author: Group7 - (Sampath, Ajay, Visesh)
| Grader: Walid Shalaby
|
| Course: ITCS 6190
| Instructor: Srinivas Akella
|
| Language: Java
| Version : 1.8.0_101
|
| Deficiencies: No logical errors.
*===========================================================================*/
import java.util.Arrays;
import java.util.Iterator;
import org.apache.commons.math3.util.FastMath;
import com.google.common.collect.AbstractIterator;
/**
* Dense double vector implementation.
*/
public final class DenseDoubleVector implements DoubleVector {
private final double[] vector;
/**
* Creates a new vector with the given length.
*/
public DenseDoubleVector(int length) {
this.vector = new double[length];
}
/**
* Creates a new vector with the given length and default value.
*
* @param length
* the length of the new vector.
* @param the
* value of all the vector elements.
*/
public DenseDoubleVector(int length, double val) {
this(length);
Arrays.fill(vector, val);
}
/**
* Creates a new vector with the given array. This wraps a copy of the given
* array.
*/
public DenseDoubleVector(double[] arr) {
this.vector = new double[arr.length];
System.out.println("double vec" + arr.length + "vec length" + this.vector.length);
System.arraycopy(arr, 0, this.vector, 0, arr.length);
}
/**
* Creates a new vector with the given array and the last value 'lastValue'.
* This resulting vector will be of size array.length+1.
*
* @param array
* the first part of the vector.
* @param lastValue
* the element that will be at index length-1 (last position) in
* the resulting vector.
*/
public DenseDoubleVector(double[] array, double lastValue) {
this.vector = new double[array.length + 1];
System.arraycopy(array, 0, this.vector, 0, array.length);
this.vector[array.length] = lastValue;
}
/**
* Creates a new vector with the given array and the first value
* firstElement.
*
* @param firstElement
* the element that will be at index 0 (first position) in the
* resulting vector.
* @param array
* the rest of the array for the vector.
*/
public DenseDoubleVector(double firstElement, double[] array) {
this.vector = new double[array.length + 1];
this.vector[0] = firstElement;
System.arraycopy(array, 0, this.vector, 1, array.length);
}
/**
* Transforms the given vector into this vector.
*
* @param vec
* a double vector.
*/
public DenseDoubleVector(DoubleVector vec) {
this.vector = new double[vec.getDimension()];
if (vec.isSparse()) {
Iterator<DoubleVectorElement> iterateNonZero = vec.iterateNonZero();
while (iterateNonZero.hasNext()) {
DoubleVectorElement next = iterateNonZero.next();
this.vector[next.getIndex()] = next.getValue();
}
} else {
System.arraycopy(vec.toArray(), 0, this.vector, 0, this.vector.length);
}
}
@Override
public final double get(int index) {
return vector[index];
}
@Override
public final int getLength() {
return vector.length;
}
@Override
public int getDimension() {
return getLength();
}
@Override
public final void set(int index, double value) {
vector[index] = value;
}
@Override
public DoubleVector apply(DoubleVectorFunction func) {
DenseDoubleVector newV = new DenseDoubleVector(this.vector);
for (int i = 0; i < vector.length; i++) {
newV.vector[i] = func.calculate(i, vector[i]);
}
return newV;
}
@Override
public DoubleVector apply(DoubleVector other, DoubleDoubleVectorFunction func) {
DenseDoubleVector newV = (DenseDoubleVector) deepCopy();
for (int i = 0; i < vector.length; i++) {
newV.vector[i] = func.calculate(i, vector[i], other.get(i));
}
return newV;
}
@Override
public final DoubleVector add(DoubleVector v) {
DoubleVector newv = null;
if (v.isSparse()) {
newv = new DenseDoubleVector(vector);
Iterator<DoubleVectorElement> iterateNonZero = v.iterateNonZero();
while (iterateNonZero.hasNext()) {
DoubleVectorElement next = iterateNonZero.next();
newv.set(next.getIndex(), this.get(next.getIndex()) + next.getValue());
}
} else {
newv = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
newv.set(i, this.get(i) + v.get(i));
}
}
return newv;
}
@Override
public final DoubleVector add(double scalar) {
DoubleVector newv = new DenseDoubleVector(this.getLength());
for (int i = 0; i < this.getLength(); i++) {
newv.set(i, this.get(i) + scalar);
}
return newv;
}
@Override
public final DoubleVector subtract(DoubleVector v) {
DoubleVector newv = null;
if (v.isSparse()) {
newv = new DenseDoubleVector(vector);
Iterator<DoubleVectorElement> iterateNonZero = v.iterateNonZero();
while (iterateNonZero.hasNext()) {
DoubleVectorElement next = iterateNonZero.next();
newv.set(next.getIndex(), this.get(next.getIndex()) - next.getValue());
}
} else {
newv = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
newv.set(i, this.get(i) - v.get(i));
}
}
return newv;
}
@Override
public final DoubleVector subtract(double v) {
DenseDoubleVector newv = new DenseDoubleVector(vector.length);
for (int i = 0; i < vector.length; i++) {
newv.set(i, vector[i] - v);
}
return newv;
}
@Override
public final DoubleVector subtractFrom(double v) {
DenseDoubleVector newv = new DenseDoubleVector(vector.length);
for (int i = 0; i < vector.length; i++) {
newv.set(i, v - vector[i]);
}
return newv;
}
@Override
public DoubleVector multiply(double scalar) {
DoubleVector v = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
v.set(i, this.get(i) * scalar);
}
return v;
}
@Override
public DoubleVector multiply(DoubleVector v) {
DoubleVector newv = new DenseDoubleVector(this.getLength());
if (v.isSparse()) {
Iterator<DoubleVectorElement> iterateNonZero = v.iterateNonZero();
while (iterateNonZero.hasNext()) {
DoubleVectorElement next = iterateNonZero.next();
newv.set(next.getIndex(), this.get(next.getIndex()) * next.getValue());
}
} else {
for (int i = 0; i < v.getLength(); i++) {
newv.set(i, this.get(i) * v.get(i));
}
}
return newv;
}
@Override
public DoubleVector divide(double scalar) {
if (scalar == 0d) {
throw new java.lang.ArithmeticException("/ by zero");
}
DenseDoubleVector v = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
v.set(i, this.get(i) / scalar);
}
return v;
}
@Override
public DoubleVector divideFrom(double scalar) {
DoubleVector v = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
if (this.get(i) != 0.0d) {
double result = scalar / this.get(i);
v.set(i, result);
} else {
throw new java.lang.ArithmeticException("/ by zero");
}
}
return v;
}
@Override
public DoubleVector divideFrom(DoubleVector vector) {
DoubleVector v = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
if (this.get(i) != 0.0d) {
double result = vector.get(i) / this.get(i);
v.set(i, result);
} else {
throw new java.lang.ArithmeticException("/ by zero");
}
}
return v;
}
@Override
public DoubleVector divide(DoubleVector vector) {
DoubleVector v = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
if (vector.get(i) != 0.0d) {
double result = this.get(i) / vector.get(i);
v.set(i, result);
} else {
throw new java.lang.ArithmeticException("/ by zero");
}
}
return v;
}
@Override
public DoubleVector pow(double x) {
DenseDoubleVector v = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
double value = 0.0d;
// it is faster to multiply when we having ^2
if (x == 2d) {
value = vector[i] * vector[i];
} else {
value = FastMath.pow(vector[i], x);
}
v.set(i, value);
}
return v;
}
@Override
public DoubleVector sqrt() {
DoubleVector v = new DenseDoubleVector(this.getLength());
for (int i = 0; i < v.getLength(); i++) {
v.set(i, FastMath.sqrt(vector[i]));
}
return v;
}
@Override
public double sum() {
double sum = 0.0d;
for (double aVector : vector) {
sum += aVector;
}
return sum;
}
@Override
public DoubleVector abs() {
DoubleVector v = new DenseDoubleVector(getLength());
for (int i = 0; i < v.getLength(); i++) {
v.set(i, FastMath.abs(vector[i]));
}
return v;
}
@Override
public double dot(DoubleVector s) {
double dotProduct = 0.0d;
if (s.isSparse()) {
Iterator<DoubleVectorElement> iterateNonZero = s.iterateNonZero();
while (iterateNonZero.hasNext()) {
DoubleVectorElement next = iterateNonZero.next();
dotProduct += this.get(next.getIndex()) * next.getValue();
}
} else {
for (int i = 0; i < getLength(); i++) {
dotProduct += this.get(i) * s.get(i);
}
}
return dotProduct;
}
@Override
public DoubleVector slice(int length) {
return slice(0, length);
}
@Override
public DoubleVector slice(int start, int end) {
DoubleVector nv = new DenseDoubleVector(end - start);
int index = 0;
for (int i = start; i < end; i++) {
nv.set(index++, vector[i]);
}
return nv;
}
@Override
public DoubleVector sliceByLength(int start, int length) {
DoubleVector nv = new DenseDoubleVector(length);
int index = start;
for (int i = 0; i < length; i++) {
nv.set(i, vector[index++]);
}
return nv;
}
@Override
public double max() {
double max = -Double.MAX_VALUE;
for (int i = 0; i < getLength(); i++) {
double d = vector[i];
if (d > max) {
max = d;
}
}
return max;
}
@Override
public int maxIndex() {
double max = -Double.MAX_VALUE;
int maxIndex = 0;
for (int i = 0; i < getLength(); i++) {
double d = vector[i];
if (d > max) {
max = d;
maxIndex = i;
}
}
return maxIndex;
}
@Override
public double min() {
double min = Double.MAX_VALUE;
for (int i = 0; i < getLength(); i++) {
double d = vector[i];
if (d < min) {
min = d;
}
}
return min;
}
@Override
public int minIndex() {
double min = Double.MAX_VALUE;
int minIndex = 0;
for (int i = 0; i < getLength(); i++) {
double d = vector[i];
if (d < min) {
min = d;
minIndex = i;
}
}
return minIndex;
}
@Override
public final double[] toArray() {
return vector;
}
@Override
public boolean isSparse() {
return false;
}
@Override
public boolean isSingle() {
return false;
}
@Override
public DoubleVector deepCopy() {
final double[] src = vector;
final double[] dest = new double[vector.length];
System.arraycopy(src, 0, dest, 0, vector.length);
return new DenseDoubleVector(dest);
}
@Override
public Iterator<DoubleVectorElement> iterateNonZero() {
return new NonZeroIterator();
}
@Override
public Iterator<DoubleVectorElement> iterate() {
return new DefaultIterator();
}
@Override
public DoubleVector log() {
DoubleVector v = new DenseDoubleVector(getLength());
for (int i = 0; i < v.getLength(); i++) {
v.set(i, FastMath.log(vector[i]));
}
return v;
}
@Override
public DoubleVector exp() {
DoubleVector v = new DenseDoubleVector(getLength());
for (int i = 0; i < v.getLength(); i++) {
v.set(i, FastMath.exp(vector[i]));
}
return v;
}
@Override
public final String toString() {
if (getLength() < 50) {
return Arrays.toString(vector);
} else {
return getLength() + "x1";
}
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + Arrays.hashCode(vector);
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
DenseDoubleVector other = (DenseDoubleVector) obj;
return Arrays.equals(vector, other.vector);
}
/**
* Non-zero iterator for vector elements.
*/
private final class NonZeroIterator extends AbstractIterator<DoubleVectorElement> {
private final DoubleVectorElement element = new DoubleVectorElement();
private final double[] array;
private int currentIndex = 0;
private NonZeroIterator() {
this.array = vector;
}
@Override
protected final DoubleVectorElement computeNext() {
if (currentIndex >= array.length)
return endOfData();
while (array[currentIndex] == 0.0d) {
currentIndex++;
if (currentIndex >= array.length)
return endOfData();
}
element.setIndex(currentIndex);
element.setValue(array[currentIndex]);
currentIndex++;
return element;
}
}
/**
* Iterator for all elements.
*/
private final class DefaultIterator extends AbstractIterator<DoubleVectorElement> {
private final DoubleVectorElement element = new DoubleVectorElement();
private final double[] array;
private int currentIndex = 0;
private DefaultIterator() {
this.array = vector;
}
@Override
protected final DoubleVectorElement computeNext() {
if (currentIndex < array.length) {
element.setIndex(currentIndex);
element.setValue(array[currentIndex]);
currentIndex++;
return element;
} else {
return endOfData();
}
}
}
/**
* @return a new vector with dimension num and a default value of 1.
*/
public static DenseDoubleVector ones(int num) {
return new DenseDoubleVector(num, 1.0d);
}
/**
* @return a new vector with dimension num and a default value of 0.
*/
public static DenseDoubleVector zeros(int num) {
return new DenseDoubleVector(num);
}
/**
* @return a new vector filled from index, to index, with a given stepsize.
*/
public static DenseDoubleVector fromUpTo(double from, double to, double stepsize) {
DenseDoubleVector v = new DenseDoubleVector((int) (FastMath.round(((to - from) / stepsize) + 0.5)));
for (int i = 0; i < v.getLength(); i++) {
v.set(i, from + i * stepsize);
}
return v;
}
@Override
public boolean isNamed() {
return false;
}
@Override
public String getName() {
return null;
}
}