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Vector.java
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Vector.java
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public class Vector {
private int rows, cols;
private double[][] fullVector;
public Vector(int r) {
rows = r;
cols = 1;
fullVector = new double[rows][cols];
}
public Vector(double[] fVector) {
rows = fVector.length;
cols = 1;
this.fullVector = new double[rows][cols];
for (int i = 0; i < fVector.length; i++) {
fullVector[i][0] = fVector[i];
}
}
public Vector(double[][] fullVector) {
this.fullVector = fullVector;
rows = fullVector.length;
cols = 1;
}
public Vector sigmoid() {
double[] fVector = new double[dimensions()[0]];
for (int i = 0; i < rows; i++) {
fVector[i] = 1 / (1 + Math.exp(fullVector[i][0]));
}
Vector f = new Vector(fVector);
return f;
}
public Vector sigmoidDerivative() {
double[] fVector = new double[dimensions()[0]];
double d,etothenegativez;
for (int i = 0; i < rows; i++) {
etothenegativez = Math.exp(-fullVector[i][0]);
d = etothenegativez / (Math.pow(1 + etothenegativez, 2));
fVector[i] = d;
}
Vector f = new Vector(fVector);
return f;
}
public int[] dimensions() {
int[] dims = { rows, cols };
return dims;
}
public double get(int r, int c) {
return fullVector[r][c];
}
private boolean checkDimensionsEqual(Vector otherVector) {
for (int i = 0; i < dimensions().length; i++) {
if (dimensions()[i] != otherVector.dimensions()[i]) {
return false;
}
}
return true;
}
// for testing
public String toString() {
String r = "[";
for (int i = 0; i < rows - 1; i++) {
r += get(i, 0) + ", ";
}
r += get(rows - 1, 0) + "]";
return r;
}
public Vector scalarMultiplication(double k) {
double[] fVector = new double[dimensions()[0]];
for (int i = 0; i < rows; i++) {
fVector[i] = fullVector[i][0] * k;
}
Vector f = new Vector(fVector);
return f;
}
public Vector exp(double k) {
double[] fVector = new double[dimensions()[0]];
for (int i = 0; i < rows; i++) {
fVector[i] = Math.pow(fullVector[i][0], k);
}
Vector f = new Vector(fVector);
return f;
}
public Vector scalarAddition(double k) {
double[] fVector = new double[dimensions()[0]];
for (int i = 0; i < rows; i++) {
fVector[i] = fullVector[i][0] + k;
}
Vector f = new Vector(fVector);
return f;
}
public Matrix transpose() {
double[][] rd = new double[cols][rows];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
rd[j][i] = fullVector[i][j];
}
}
Matrix r = new Matrix(rd);
return r;
}
public Vector add(Vector otherVector) {
double[] fVector = new double[dimensions()[0]];
if (checkDimensionsEqual(otherVector)) {
for (int i = 0; i < rows; i++) {
fVector[i] += fullVector[i][0] + otherVector.get(i, 0);
}
Vector r = new Vector(fVector);
return r;
} else {
throw new IllegalArgumentException();
}
}
public double dot(Vector otherVector) {
double p = 0.0;
if (checkDimensionsEqual(otherVector)) {
for (int i = 0; i < rows; i++) {
p += get(i, 0) * otherVector.get(i, 0);
}
return p;
}
throw new IllegalArgumentException();
}
public Vector correspondingMultiplication(Vector otherVector) {
double[] fVector = new double[dimensions()[0]];
if (checkDimensionsEqual(otherVector)) {
for (int i = 0; i < rows; i++) {
fVector[i] = get(i, 0) * otherVector.get(i, 0);
}
Vector r = new Vector(fVector);
return r;
}
throw new IllegalArgumentException();
}
public Matrix iterativeDivision(Vector denominatorVector) {
double[][] fMatrix = new double[dimensions()[0]][denominatorVector.dimensions()[0]];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < denominatorVector.dimensions()[0]; j++) {
fMatrix[i][j] = get(i, 0) / denominatorVector.get(j, 0);
}
}
Matrix r = new Matrix(fMatrix);
return r;
}
// Prerequisite: othervector is of the form 1 x n
public Matrix cross(Matrix otherVector) {
if (this.dimensions()[1] == otherVector.dimensions()[0]) {
double[][] r = new double[this.dimensions()[0]][otherVector.dimensions()[1]];
for (int i = 0; i < r.length; i++) {
for (int j = 0; j < r[0].length; j++) {
r[i][j] = get(i, 0) * otherVector.get(0, j);
}
}
Matrix returnVector = new Matrix(r);
return returnVector;
} else {
throw new IllegalArgumentException();
}
}
}