Hello everybody
Does anyone know how to calculate the maximum and minimum iterations of an algorithm in the Simulink model?
I have my model predictive control system built-in Simulink and I need to count the number of iterations during the running time.
Thank you
Mohamed
Hi,
I hope the following text from Mathwork to help you.
In general, Optimization Toolbox™ solvers iterate to find an optimum. A solver begins at an initial value x0, performs some intermediate calculations that eventually lead to a new point x1, and then repeats the process to find successive approximations x2, x3, ... of the local minimum. Processing stops after some number of iterations k.
You can limit the number of iterations or function counts by setting the MaxIterations or MaxFunctionEvaluations options for a solver using optimoptions. Or, if you want a solver to continue after reaching one of these limits, raise the values of these options. See Set and Change Options.
At any step, intermediate calculations can involve evaluating the objective function and any constraints at points near the current iterate xi. For example, the solver might estimate a gradient by finite differences. At each nearby point, the function count (F-count) increases by one. The figure Typical Iteration in 3-D Space shows that, in 3-D space with forward finite differences of size delta, one iteration typically corresponds to an increase in function count of four. In the figure, ei represents the unit vector in the ith coordinate direction.
Hi Mohamed Albira , You can use the Counter Free-Running block to count the number of iterations(ticks) it has performed. Make sure to select proper number of bits in the block. In the model, Sample time is 1e-6 s and simulation time is 1e-3. So 1000 iterations.
You can store the data in the workspace using To Workspace Block (Chosee the array data in the properties block).
Then, manually using the max and min commands find the max min value. I don't know any other suitable methods.
- Badges
- Science topic