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String to matrix Method functional to parse 2by2 matrices

featureMatrixCalculator
Lukas Reichwein 6 years ago
parent
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2 changed files with 296 additions and 228 deletions
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  1. 483
      src/main/java/com/ugsbo/matrixcalc/MatrixCalcMath.java
  2. 41
      src/test/java/com/ugsbo/matrixcalc/StringToMatrixTest.java

483
src/main/java/com/ugsbo/matrixcalc/MatrixCalcMath.java
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@ -1,229 +1,256 @@
package com.ugsbo.matrixcalc;
/**
* Contains all basic matrix math calculations.
*/
public class MatrixCalcMath {
/**
* Mutliplys matrixA and matrixB.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI)
* @return The Matrixproduct of the matricies A and B
*/
public double[][] matrixMultiplication(double[][] matrixA, double[][] matrixB) {
if (checkIfMatriciesAreLinked(matrixA, matrixB)) {
int rowOfResultMatrix = matrixA.length;
int columOfResultMatrix = matrixB[0].length;
int ColumsOfMatA = matrixA[0].length;
double[][] result = new double[rowOfResultMatrix][columOfResultMatrix];
for (int rowResult = 0; rowResult < rowOfResultMatrix; rowResult++) {
for (int columResult = 0; columResult < columOfResultMatrix; columResult++) {
for (int columOfA = 0; columOfA < ColumsOfMatA; columOfA++) {
result[rowResult][columResult] += matrixA[rowResult][columOfA] * matrixB[columOfA][columResult];
}
}
}
return result;
} else {
throw new IllegalArgumentException("Matricies must be linked");
}
}
/**
* checks if matrixA and matrixB are linked to know if it is possible to
* multiply them. If they are linked it is possible.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI)
* @return true if you can Muliply A with B false if not.
*/
public boolean checkIfMatriciesAreLinked(double[][] matrixA, double[][] matrixB) {
if (matrixA == null) {
return false;
}
if (matrixA.length == 0) {
return false;
}
if (matrixA[0].length == matrixB.length) {
return true;
}
return false;
}
/**
* Adds two matroices A and B. Adding matrix A to matrix B is the same as adding
* B to A.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI)
* @return The Matrixsum of matrix A and matrix B
*/
public double[][] matrixAddition(double[][] matrixA, double[][] matrixB) {
if (checkIfMatriciesAreTheSameDimension(matrixA, matrixB)) {
double[][] result = new double[matrixA.length][matrixA[0].length];
for (int rows = 0; rows < matrixA.length; rows++) {
for (int colums = 0; colums < matrixA[0].length; colums++) {
result[rows][colums] = matrixA[rows][colums] + matrixB[rows][colums];
}
}
return result;
} else {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
}
/**
* In order to adding two Matricies they must have the same Dimensions. This
* Methode checks if this is the case.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI)
* @return true if the Dimensions of Matrix A equals the Dimensions Matrix B
*/
public boolean checkIfMatriciesAreTheSameDimension(double[][] matrixA, double[][] matrixB) {
if (matrixA == null || matrixA.length == 0) {
return false;
}
if (matrixA[0] == null) {
return false;
}
if (matrixA.length == matrixB.length && matrixA[0].length == matrixB[0].length) {
return true;
} else {
return false;
}
}
/**
* Substracts matrix A by the matrix B. Substaction for Matrices is just the
* substraction of each component with thier coorsponding component.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI
* @return matrix A substracted by matrix B
*/
public double[][] matrixSubstraction(double[][] matrixA, double[][] matrixB) {
if (checkIfMatriciesAreTheSameDimension(matrixA, matrixB)) {
double[][] result = new double[matrixA.length][matrixA[0].length];
for (int rows = 0; rows < matrixA.length; rows++) {
for (int colums = 0; colums < matrixA[0].length; colums++) {
result[rows][colums] = matrixA[rows][colums] - matrixB[rows][colums];
}
}
return result;
} else {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
}
/**
* Transposes the Input Matrix. Swaps rows with colums.
*
* @param matrixA The Inputmatrix A wich will be Transposed
* @return The Transposed matrix of matrix A
*/
public double[][] matrixTransponation(double[][] matrixA) {
if (matrixA == null) {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
if (matrixA.length == 0) {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
if (matrixA[0] == null) {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
int columCountResult = matrixA.length;
int rowCountResult = matrixA[0].length;
double[][] result = new double[rowCountResult][columCountResult];
for (int row = 0; row < rowCountResult; row++) {
for (int colum = 0; colum < columCountResult; colum++) {
result[row][colum] = matrixA[colum][row];
}
}
return result;
}
/**
* Calculates the Determinant of a Matrix.
*
* @param matrixA The Inputmatrix
* @return The Determinant of the Matrix A
*/
public double calcDeterminat(double[][] matrixA) {
// checking if a Determinant can be calculated.
double result = 0.0;
if (checkIfMatrixIsQuadradtic(matrixA)) {
if (getMatrixRowCount(matrixA) == 2) {
result = calc2by2Determinant(matrixA);
} else if (getMatrixRowCount(matrixA) == 3) {
result = calc3by3Determinant(matrixA);
} else {
throw new IllegalArgumentException("Matrix is not 2 by 2 or 3 by 3");
}
} else {
throw new IllegalArgumentException("Matrix must be Quadratic");
}
return result;
}
/**
* Calculates the Determinat of an three by three Matrix.
*
* @param matrixA The Inputmatrix form wich the Determinat will be calculated
* @return the Determinant of the Matrix
*/
private double calc3by3Determinant(double[][] matrixA) {
double result = matrixA[0][0] * matrixA[1][1] * matrixA[2][2] + matrixA[0][1] * matrixA[1][2] * matrixA[2][0]
+ matrixA[0][2] * matrixA[1][0] * matrixA[2][1] - matrixA[0][0] * matrixA[1][2] * matrixA[2][1]
- matrixA[0][1] * matrixA[1][0] * matrixA[2][2] - matrixA[0][2] * matrixA[1][1] * matrixA[2][0];
return result;
}
/**
* Calculates the Determinat of an two by two Matrix.
*
* @param matrixA The Inputmatrix form wich the Determinat will be calculated
* @return the Determinant of the Matrix
*/
private double calc2by2Determinant(double[][] matrixA) {
double result = matrixA[0][0] * matrixA[1][1] - matrixA[0][1] * matrixA[1][0];
return result;
}
/**
* Returns the Number of rows of a Matrix.
*
* @param matrixA the Inputmatrix form wich the rows will be counted
* @return Number of rows
*/
private int getMatrixRowCount(double[][] matrixA) {
return matrixA.length;
}
/**
* Checks if the rows and colums of an Matrix are equal. If they are equal the
* Matrix is Quadratic and the function will return true.
*
* @param matrixA the Inputmatrix for wich the rows and colums will be compared
* @return isQuadratic
*/
private boolean checkIfMatrixIsQuadradtic(double[][] matrixA) {
if (matrixA == null) {
return false;
}
if (matrixA[0] == null) {
return false;
}
if (matrixA.length == matrixA[0].length) {
return true;
}
return false;
}
package com.ugsbo.matrixcalc;
import java.util.ArrayList;
/**
* Contains all basic matrix math calculations.
*/
public class MatrixCalcMath {
/**
* Mutliplys matrixA and matrixB.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI)
* @return The Matrixproduct of the matricies A and B
*/
public double[][] matrixMultiplication(double[][] matrixA, double[][] matrixB) {
if (checkIfMatriciesAreLinked(matrixA, matrixB)) {
int rowOfResultMatrix = matrixA.length;
int columOfResultMatrix = matrixB[0].length;
int ColumsOfMatA = matrixA[0].length;
double[][] result = new double[rowOfResultMatrix][columOfResultMatrix];
for (int rowResult = 0; rowResult < rowOfResultMatrix; rowResult++) {
for (int columResult = 0; columResult < columOfResultMatrix; columResult++) {
for (int columOfA = 0; columOfA < ColumsOfMatA; columOfA++) {
result[rowResult][columResult] += matrixA[rowResult][columOfA] * matrixB[columOfA][columResult];
}
}
}
return result;
} else {
throw new IllegalArgumentException("Matricies must be linked");
}
}
/**
* checks if matrixA and matrixB are linked to know if it is possible to
* multiply them. If they are linked it is possible.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI)
* @return true if you can Muliply A with B false if not.
*/
public boolean checkIfMatriciesAreLinked(double[][] matrixA, double[][] matrixB) {
if (matrixA == null) {
return false;
}
if (matrixA.length == 0) {
return false;
}
if (matrixA[0].length == matrixB.length) {
return true;
}
return false;
}
/**
* Adds two matroices A and B. Adding matrix A to matrix B is the same as adding
* B to A.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI)
* @return The Matrixsum of matrix A and matrix B
*/
public double[][] matrixAddition(double[][] matrixA, double[][] matrixB) {
if (checkIfMatriciesAreTheSameDimension(matrixA, matrixB)) {
double[][] result = new double[matrixA.length][matrixA[0].length];
for (int rows = 0; rows < matrixA.length; rows++) {
for (int colums = 0; colums < matrixA[0].length; colums++) {
result[rows][colums] = matrixA[rows][colums] + matrixB[rows][colums];
}
}
return result;
} else {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
}
/**
* In order to adding two Matricies they must have the same Dimensions. This
* Methode checks if this is the case.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI)
* @return true if the Dimensions of Matrix A equals the Dimensions Matrix B
*/
public boolean checkIfMatriciesAreTheSameDimension(double[][] matrixA, double[][] matrixB) {
if (matrixA == null || matrixA.length == 0) {
return false;
}
if (matrixA[0] == null) {
return false;
}
if (matrixA.length == matrixB.length && matrixA[0].length == matrixB[0].length) {
return true;
} else {
return false;
}
}
/**
* Substracts matrix A by the matrix B. Substaction for Matrices is just the
* substraction of each component with thier coorsponding component.
*
* @param matrixA The Inputmatrix A (right TextArea in the GUI)
* @param matrixB The Inputmatrix B (left TextArea in the GUI
* @return matrix A substracted by matrix B
*/
public double[][] matrixSubstraction(double[][] matrixA, double[][] matrixB) {
if (checkIfMatriciesAreTheSameDimension(matrixA, matrixB)) {
double[][] result = new double[matrixA.length][matrixA[0].length];
for (int rows = 0; rows < matrixA.length; rows++) {
for (int colums = 0; colums < matrixA[0].length; colums++) {
result[rows][colums] = matrixA[rows][colums] - matrixB[rows][colums];
}
}
return result;
} else {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
}
/**
* Transposes the Input Matrix. Swaps rows with colums.
*
* @param matrixA The Inputmatrix A wich will be Transposed
* @return The Transposed matrix of matrix A
*/
public double[][] matrixTransponation(double[][] matrixA) {
if (matrixA == null) {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
if (matrixA.length == 0) {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
if (matrixA[0] == null) {
throw new IllegalArgumentException("Matricies need to have the same Dimensions");
}
int columCountResult = matrixA.length;
int rowCountResult = matrixA[0].length;
double[][] result = new double[rowCountResult][columCountResult];
for (int row = 0; row < rowCountResult; row++) {
for (int colum = 0; colum < columCountResult; colum++) {
result[row][colum] = matrixA[colum][row];
}
}
return result;
}
/**
* Calculates the Determinant of a Matrix.
*
* @param matrixA The Inputmatrix
* @return The Determinant of the Matrix A
*/
public double calcDeterminat(double[][] matrixA) {
// checking if a Determinant can be calculated.
double result = 0.0;
if (checkIfMatrixIsQuadradtic(matrixA)) {
if (getMatrixRowCount(matrixA) == 2) {
result = calc2by2Determinant(matrixA);
} else if (getMatrixRowCount(matrixA) == 3) {
result = calc3by3Determinant(matrixA);
} else {
throw new IllegalArgumentException("Matrix is not 2 by 2 or 3 by 3");
}
} else {
throw new IllegalArgumentException("Matrix must be Quadratic");
}
return result;
}
/**
* Calculates the Determinat of an three by three Matrix.
*
* @param matrixA The Inputmatrix form wich the Determinat will be calculated
* @return the Determinant of the Matrix
*/
private double calc3by3Determinant(double[][] matrixA) {
double result = matrixA[0][0] * matrixA[1][1] * matrixA[2][2] + matrixA[0][1] * matrixA[1][2] * matrixA[2][0]
+ matrixA[0][2] * matrixA[1][0] * matrixA[2][1] - matrixA[0][0] * matrixA[1][2] * matrixA[2][1]
- matrixA[0][1] * matrixA[1][0] * matrixA[2][2] - matrixA[0][2] * matrixA[1][1] * matrixA[2][0];
return result;
}
/**
* Calculates the Determinat of an two by two Matrix.
*
* @param matrixA The Inputmatrix form wich the Determinat will be calculated
* @return the Determinant of the Matrix
*/
private double calc2by2Determinant(double[][] matrixA) {
double result = matrixA[0][0] * matrixA[1][1] - matrixA[0][1] * matrixA[1][0];
return result;
}
/**
* Returns the Number of rows of a Matrix.
*
* @param matrixA the Inputmatrix form wich the rows will be counted
* @return Number of rows
*/
private int getMatrixRowCount(double[][] matrixA) {
return matrixA.length;
}
/**
* Checks if the rows and colums of an Matrix are equal. If they are equal the
* Matrix is Quadratic and the function will return true.
*
* @param matrixA the Inputmatrix for wich the rows and colums will be compared
* @return isQuadratic
*/
private boolean checkIfMatrixIsQuadradtic(double[][] matrixA) {
if (matrixA == null) {
return false;
}
if (matrixA[0] == null) {
return false;
}
if (matrixA.length == matrixA[0].length) {
return true;
}
return false;
}
public double[][] stringToMatrix(String stringMatrix) {
ArrayList<String[]> singleNumbersArr = new ArrayList<String[]>();
//Splitting the strings into thier rows
String[] singleNumbers = null;
String[] rows = stringMatrix.split("\n");
for (int i = 0; i < rows.length; i++) {
System.out.println(rows[i]);
singleNumbers = rows[i].split("\\s");
singleNumbersArr.add(singleNumbers);
}
int rowCount = rows.length; //row.length
int columCount = singleNumbersArr.size(); //output.length
double[][] result = new double[columCount][rowCount];
for (int columIndex = 0; columIndex < singleNumbersArr.size(); columIndex++) {
for (int rowIndex = 0; rowIndex < singleNumbers.length; rowIndex++) {
result[columIndex][rowIndex] = Double.parseDouble(singleNumbersArr.get(columIndex)[rowIndex]);
}
}
return result;
}
}

41
src/test/java/com/ugsbo/matrixcalc/StringToMatrixTest.java
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@ -0,0 +1,41 @@
package com.ugsbo.matrixcalc;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import org.junit.Before;
import org.junit.Test;
/**
* Tests the funktionality to Calculate the Determinant of a Matrix.
*/
public class StringToMatrixTest {
private MatrixCalcMath matrixMath;
@Before
public void setup() {
matrixMath = new MatrixCalcMath();
}
@Test
public void StringWithSingleDigitNumbersToMatrix_ReturnsEquivalentMatrix() {
String inputString = "1";
double[][] expected = { { 1.0 } };
double[][] result = matrixMath.stringToMatrix(inputString);
assertArrayEquals("The first row is not correct", expected[0], result[0], 0.1);
}
@Test
public void StringWithfourDigitNumbersToMatrix_ReturnsEquivalentMatrix() {
String inputString = "1 2\n3 4";
double[][] expected = { { 1.0, 2.0 }, {3.0, 4.0} };
double[][] result = matrixMath.stringToMatrix(inputString);
assertArrayEquals("The first row is not correct", expected[0], result[0], 0.1);
assertArrayEquals("The first row is not correct", expected[1], result[1], 0.1);
}
}
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