set und getMatrixAt

Startcode/matrix.c

@@ -27,12 +27,22 @@ void clearMatrix(Matrix *matrix)
 
 void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
-    
+    if(rowIdx < matrix.rows && colIdx < matrix.cols)
+    {
+        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)
+    {
+       return matrix.data[rowIdx * matrix.cols + colIdx];
+    }
+    else
+    {
+        return UNDEFINED_MATRIX_VALUE;
+    }
 }
 
 Matrix add(const Matrix matrix1, const Matrix matrix2)