2nd fail fixed

matrix.c

@@ -6,30 +6,118 @@
 
 Matrix createMatrix(unsigned int rows, unsigned int cols)
 {
-    
+    Matrix m = {0, 0, NULL};
+
+    if (rows > 0 && cols > 0)
+    {
+        m.rows = rows;
+        m.cols = cols;
+        m.buffer = malloc(rows * cols * sizeof(int));
+    }
+
+    return m;
 }
 
 void clearMatrix(Matrix *matrix)
 {
-    
+
+    if (matrix == NULL)
+    {
+        return;
+    }
+
+    // Speicher freigeben, falls vorhanden
+    free(matrix->buffer);
+    matrix->buffer = NULL;
+
+    // Metadaten zurücksetzen
+    matrix->rows = 0;
+    matrix->cols = 0;
 }
 
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    matrix.buffer[rowIdx * matrix.cols + colIdx] = value; // setzte Matrix auf den Wert value am Punkt (row col)
 }
 
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    MatrixType value = 0;
+
+    if (rowIdx < matrix.rows && colIdx < matrix.cols)
+    {
+        value = matrix.buffer[rowIdx * matrix.cols + colIdx]; // hole Wert value am Punkt (row col)
+    }
+
+    return value;
 }
 
 Matrix add(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    Matrix result = {0};
+
+    if (matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols)
+    {
+        return result;
+    }
+
+    result.rows = matrix1.rows;
+    result.cols = matrix1.cols;
+    result.buffer = malloc(result.rows * result.cols * sizeof(MatrixType));
+
+    // wenn buffer nicht allokiert werden kann dann zurücksetzen und abbrechen
+    if (result.buffer == NULL)
+    {
+        result.rows = result.cols = 0;
+
+        return result;
+    }
+
+    // Matritzenaddition
+    for (unsigned int i = 0; i < result.rows; i++)
+    {
+        for (unsigned int j = 0; j < result.cols; j++)
+        {
+            result.buffer[i * result.cols + j] = matrix1.buffer[i * matrix1.cols + j] + matrix2.buffer[i * matrix2.cols + j];
+        }
+    }
+    return result;
 }
 
 Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
-    
+    Matrix result = {0};
+
+    if (matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols)
+    {
+        return result;
+    }
+
+    result.rows = matrix1.rows;
+    result.cols = matrix1.cols;
+    result.buffer = malloc(result.rows * result.cols * sizeof(MatrixType));
+
+    // wenn buffer nicht allokiert werden kann dann zurücksetzen und abbrechen
+    if (result.buffer == NULL)
+    {
+        result.rows = result.cols = 0;
+
+        return result;
+    }
+
+    // Matritzenmultiplikation
+    for (unsigned int i = 0; i < result.rows; i++)
+    {
+        for (unsigned int j = 0; j < result.cols; j++)
+        {
+            MatrixType sum = 0;
+            for (unsigned int k = 0; k < matrix1.cols; k++)
+            {
+                sum += matrix1.buffer[i * matrix1.cols + k] * matrix2.buffer[k * matrix2.cols + j];
+            }
+            result.buffer[i * result.cols + j] = sum;
+        }
+    }
+
+    return result;
 }

matrix.h

@@ -7,6 +7,13 @@ typedef float MatrixType;
 
 // TODO Matrixtyp definieren
 
+typedef struct 
+{
+    unsigned int rows;   // Anzahl der Zeilen
+    unsigned int cols;   // Anzahl der Spalten
+    MatrixType *buffer;    // Zeiger auf die Matrixdaten 
+} Matrix;
+
 
 Matrix createMatrix(unsigned int rows, unsigned int cols);
 void clearMatrix(Matrix *matrix);