92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include "matrix.h"
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// TODO Matrix-Funktionen implementieren
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Matrix createMatrix(unsigned int rows, unsigned int cols)
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{
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Matrix matrix;
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matrix.rows = rows;
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matrix.cols = cols;
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matrix.buffer = (float *)malloc(rows * cols * sizeof(MatrixType));
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if (matrix.buffer != NULL) {
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}
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return matrix;
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}
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void clearMatrix(Matrix *matrix)
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{
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if (matrix->buffer != NULL) {
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free(matrix->buffer);
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matrix->buffer = NULL;
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}
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matrix->rows = 0;
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matrix->cols = 0;
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}
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void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
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{
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if(rowIdx >= matrix.rows || colIdx >= matrix.cols){
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return;
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}
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matrix.buffer[rowIdx * matrix.cols + colIdx] = value;
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}
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MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
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{
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if(rowIdx >= matrix.rows || colIdx >= matrix.cols){
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return 0;
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}
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MatrixType value;
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value = matrix.buffer[rowIdx * matrix.cols + colIdx];
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return value;
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}
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Matrix add(const Matrix matrix1, const Matrix matrix2)
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{
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if (matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols) { // Matrixen können nur addiert werden, sofern sie jeweils die gleiche Anzahl Spalten und Zeilen haben
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Matrix errorMatrix = createMatrix(0, 0);
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errorMatrix.buffer = NULL;
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return errorMatrix;
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}
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Matrix result = createMatrix(matrix1.rows, matrix1.cols);
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for (unsigned int i = 0; i < matrix1.rows; i++) {
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for (unsigned int j = 0; j < matrix1.cols; j++) {
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MatrixType sum = getMatrixAt(matrix1, i, j) + getMatrixAt(matrix2, i, j);
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setMatrixAt(sum, result, i, j);
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}
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}
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return result;
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}
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Matrix multiply(const Matrix matrix1, const Matrix matrix2)
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{
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if (matrix1.cols != matrix2.rows){
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Matrix errorMatrix = createMatrix(0, 0);
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errorMatrix.buffer = NULL;
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return errorMatrix;
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}
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Matrix matrix3 = createMatrix(matrix1.rows, matrix2.cols);
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for( size_t i = 0; i < matrix1.rows; i++){
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for(size_t j = 0; j < matrix2.cols; j++){
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MatrixType sum = 0;
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for(size_t k = 0; k < matrix1.cols; k++){
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sum += getMatrixAt(matrix1, i, k) * getMatrixAt(matrix2, k, j);
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}
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setMatrixAt(sum, matrix3, i, j);
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}
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}
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return matrix3;
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}
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