Numerical Analysis and Modelling - CodeLab CodeLab is an interactive laboratory for making experiments with selected numerical library codes. In the available test laboratories, there are graphical user interfaces where the user may select a numerical problem to be solved, and a numerical method for solving it. Some laboratories also allow to experiment with a self-defined problem. Moreover, numerical parameters and parameters related to the problem may be entered. The results may be viewed in form of graphical diagrams, as well as in formatted tables of numbers.