little fixes

matrix.c

@@ -158,3 +158,105 @@ Matrix multiply(const Matrix matrix1, const Matrix matrix2)
     }
 }
 
+
+
+/* MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
+{
+    if (matrix.buffer == NULL || rowIdx >= matrix.rows || colIdx >= matrix.cols)
+    {
+        return UNDEFINED_MATRIX_VALUE;
+    }
+
+    return matrix.buffer[rowIdx * matrix.cols + colIdx];
+}
+
+Matrix add(const Matrix matrix1, const Matrix matrix2)
+{
+    Matrix result;
+
+    if (matrix1.buffer == NULL || matrix2.buffer == NULL || matrix1.rows != matrix2.rows)
+    {
+        result.rows = 0;
+        result.cols = 0;
+        result.buffer = NULL;
+        return result;
+    }
+
+    if (matrix1.cols == matrix2.cols)
+    {
+        result = createMatrix(matrix1.rows, matrix1.cols);
+        for (int i = 0; i < matrix1.rows; i++)
+        {
+            for (int j = 0; j < matrix1.cols; j++)
+            {
+                MatrixType value = getMatrixAt(matrix1, i, j) + getMatrixAt(matrix2, i, j);
+                setMatrixAt(value, result, i, j);
+            }
+        }
+        return result;
+    }
+
+    if (matrix1.cols == 1 && matrix2.cols > 1)
+    {
+        result = createMatrix(matrix1.rows, matrix2.cols);
+        for (int i = 0; i < matrix1.rows; i++)
+        {
+            for (int j = 0; j < matrix2.cols; j++)
+            {
+                MatrixType value = getMatrixAt(matrix1, i, 0) + getMatrixAt(matrix2, i, j);
+                setMatrixAt(value, result, i, j);
+            }
+        }
+        return result;
+    }
+    else if (matrix2.cols == 1 && matrix1.cols > 1)
+    {
+        result = createMatrix(matrix1.rows, matrix1.cols);
+        for (int i = 0; i < matrix1.rows; i++)
+        {
+            for (int j = 0; j < matrix1.cols; j++)
+            {
+                MatrixType value = getMatrixAt(matrix1, i, j) + getMatrixAt(matrix2, i, 0);
+                setMatrixAt(value, result, i, j);
+            }
+        }
+        return result;
+    }
+
+    //Fall: Unterschiedliche Spaltenanzahl, beide ungleich 1
+    result.rows = 0;
+    result.cols = 0;
+    result.buffer = NULL;
+    return result;
+}
+
+Matrix multiply(const Matrix matrix1, const Matrix matrix2)
+{
+    Matrix result;
+
+    if (matrix1.buffer == NULL || matrix2.buffer == NULL || matrix1.cols != matrix2.rows)
+    {
+        result.rows = 0;
+        result.cols = 0;
+        result.buffer = NULL;
+        return result;
+    }
+
+    result = createMatrix(matrix1.rows, matrix2.cols);
+
+    for (int i = 0; i < matrix1.rows; i++)
+    {
+        for (int j = 0; j < matrix2.cols; j++)
+        {
+            MatrixType sum = 0;
+
+            for (int k = 0; k < matrix1.cols; k++)
+            {
+                sum += getMatrixAt(matrix1, i, k) * getMatrixAt(matrix2, k, j);
+            }
+            setMatrixAt(sum, result, i, j);
+        }
+    }
+
+    return result;
+}*/