O.o
/
UGSBO
3
2
Fork 1
Code Issues 15 Pull Requests Releases Activity
Browse Source

String to matrix Method functional to parse 2by2 matrices

featureMatrixCalculator
Lukas Reichwein 5 years ago
parent
f7bd4010f7
commit
c6b1fae7a6
2 changed files with 296 additions and 228 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  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
View File

@ -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
View File

@ -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);
}
}
Write Preview
Loading…
Cancel
Save