85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
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public class Vector {
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public static void scalarMultiplication(int[] vector, int scalar) {
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for (int position = 0; position < vector.length; position++) {
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vector[position] *= scalar;
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}
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}
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public static void vectorProduct(int[] vector1, int[] vector2) {
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if (vector1.length == vector2.length && vector2.length == 3) {
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int[] kreuzVektor3D = new int[3];
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kreuzVektor3D[0] = (vector1[1] * vector2[2]) - (vector1[2] * vector2[1]);
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kreuzVektor3D[1] = (vector1[2] * vector2[0]) - (vector1[0] * vector2[2]);
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kreuzVektor3D[2] = (vector1[0] * vector2[1]) - (vector1[1] * vector2[0]);
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System.out.println("Ergebnis des Kreuzproduktes: [" + kreuzVektor3D[0] + ", " + kreuzVektor3D[1] + ", "
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+ kreuzVektor3D[2] + "]");
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}
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else if (vector1.length == vector2.length && vector2.length == 2) {
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int kreuzVektor2D = 0;
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kreuzVektor2D = (vector1[0] * vector2[1]) - (vector1[1] * vector2[0]);
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System.out.println("Ergebnis des Kreuzproduktes: " + kreuzVektor2D);
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}
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else {
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System.out.println("Wegen unterschiedlichen Dimensionen ist das Kreuzprodukt nicht erlaubt");
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}
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}
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public static double vectorLength(int[] vector) {
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double qSumme = 0.0;
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double betrag = 0.0;
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for (int i = 0; i < vector.length; i++) {
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qSumme = qSumme + (vector[i] * vector[i]);
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}
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betrag = Math.sqrt(qSumme);
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return betrag;
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}
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public static int[][] matrixMultiplication(int[][] matrix, int scalar) {
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int[][] ausgabe = null;
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// boolean matrixFlag = false;
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// if (matrix.length ==3 && matrix[0].length == 3 && matrix[1].length == 3 &&
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// matrix[2].length == 3){
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// matrixFlag =true;
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// }
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if (matrix.length == 3 && matrix[0].length == 3 && matrix[1].length == 3 && matrix[2].length == 3) {
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ausgabe = new int[3][3];
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for (int außenPos = 0; außenPos < matrix.length; außenPos++) {
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for (int innenPos = 0; innenPos < matrix[außenPos].length; innenPos++) {
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ausgabe[außenPos][innenPos] = matrix[außenPos][innenPos] * scalar;
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}
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}
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}
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return ausgabe;
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}
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public static void main(String[] args) {
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int[] vector = { 2, 4, 7 };
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int scalar = 3;
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scalarMultiplication(vector, scalar);
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System.out.println(vector[0] + " " + vector[1] + " " + vector[2]);
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int[] vector1 = { 2, 5, 1 };
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int[] vector2 = { 4, 7, 2 };
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vectorProduct(vector1, vector2);
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int[] vector3 = { 2, 5 };
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int[] vector4 = { 4, 7 };
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vectorProduct(vector3, vector4);
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}
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} |