Bug-Fix create matrix

matrix.c

@@ -1,35 +1,141 @@
 #include <stdlib.h>
 #include <string.h>
 #include "matrix.h"
+#include <stdio.h>
 
 // TODO Matrix-Funktionen implementieren
 
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
-    
+    Matrix matrix;
+
+    if(rows == 0 || cols == 0)
+    {
+        matrix.rows = 0;
+        matrix.cols = 0;
+        matrix.data = NULL;
+        return matrix;
+    }
+
+
+    matrix.rows = rows;
+    matrix.cols = cols;
+
+    matrix.data = (MatrixType *)malloc(rows * cols * sizeof(MatrixType));
+
+    if (matrix.data == NULL)
+    {
+
+        matrix.rows = 0;
+        matrix.cols = 0;
+
+        return matrix;
+    }
+
+    for (int i = 0; i < rows; i++)
+    {
+        for (int j = 0; j < cols; j++)
+        {
+            matrix.data[i * matrix.cols + j] = UNDEFINED_MATRIX_VALUE;
+        }
+    }
+    return matrix;
 }
 
 void clearMatrix(Matrix *matrix)
 {
-    
+    if (matrix->data != NULL)
+    {
+        free(matrix->data);
+        matrix->data = NULL;
+    }
+
+    matrix->rows = 0;
+    matrix->cols = 0;
 }
 
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    if (rowIdx >= matrix.rows || colIdx >= matrix.cols)
+    {
+        fprintf(stderr, "Fehler: Ungültiger Index (%u, %u) bei Matrixgröße %u x %u\n", rowIdx, colIdx, matrix.rows, matrix.cols);
+        return; // abbruch falls fehler
+    }
+
+    matrix.data[rowIdx * matrix.cols + colIdx] = value;
 }
 
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    if (rowIdx >= matrix.rows || colIdx >= matrix.cols)
+    {
+        fprintf(stderr, "Fehler: Ungültiger Index (%u, %u) bei Matrixgröße %u x %u\n", rowIdx, colIdx, matrix.rows, matrix.cols);
+        return UNDEFINED_MATRIX_VALUE;
+    }
+
+    return matrix.data[rowIdx * matrix.cols + colIdx];
 }
 
 Matrix add(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    if (matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols)
+    {
+        fprintf(stderr, "Fehler: Matrizen haben unterschiedliche Größen (%u x %u) und (%u x %u)\n",
+                matrix1.rows, matrix1.cols, matrix2.rows, matrix2.cols);
+
+        Matrix empty = {0, 0, NULL};
+        return empty;
+    }
+
+    Matrix result = createMatrix(matrix1.rows, matrix1.cols);
+
+    if (result.data == NULL)
+    {
+        fprintf(stderr, "Fehler: Speicher konnte nicht reserviert werden!\n");
+        return result;
+    }
+
+    for (int i = 0; i < matrix1.rows; i++)
+    {
+        for (int j = 0; j < matrix1.cols; j++)
+        {
+            result.data[i * result.cols + j] = matrix1.data[i * matrix1.cols + j] + matrix2.data[i * matrix2.cols + j];
+        }
+    }
+    return result;
 }
 
 Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    if (matrix1.cols != matrix2.rows)
+    {
+        fprintf(stderr, "Fehler: Matrizen der Dimension (%u x %u) und (%u x %u) koennen nicht multipliziert werden\n",
+                matrix1.rows, matrix1.cols, matrix2.rows, matrix2.cols);
+
+        Matrix empty = {0, 0, NULL};
+        return empty;
+    }
+
+    Matrix result = createMatrix(matrix1.rows, matrix2.cols);
+
+    if (result.data == NULL)
+    {
+        fprintf(stderr, "Fehler: Speicher konnte nicht reserviert werden!\n");
+        return result;
+    }
+
+    for (int i = 0; i < matrix1.rows; i++)
+    {
+        for (int j = 0; j < matrix2.cols; j++)
+        {
+            MatrixType sum = 0.0;
+
+            for (int k = 0; k < matrix1.cols; k++)
+            {
+                sum += matrix1.data[i * matrix1.cols + k] * matrix2.data[k * matrix2.cols + j];
+            }
+            result.data[i * result.cols +j] = sum;
+        }
+    }
+    return result;
 }

matrix.h

@@ -7,6 +7,14 @@ typedef float MatrixType;
 
 // TODO Matrixtyp definieren
 
+typedef struct Matrix {
+    unsigned int rows;
+    unsigned int cols;
+    MatrixType *data;
+    #define buffer data
+}   Matrix;
+
+
 
 Matrix createMatrix(unsigned int rows, unsigned int cols);
 void clearMatrix(Matrix *matrix);