Live display of variables during MATLAB simulation [closed] - matlab

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I have a simulation which has numerous iterations. There are variable matrices whose values I would like to monitor while the simulation is happening. What are good ways of doing this?

Answer 1

I have two tools that I regularly use for something like this.
1. Iterative output that erases with each iteration
This works well for an optimization where you have a scalar function output you want to monitor.
Before my while loop, I'll define screenOut = []; and an output formula in screenOutFormat. In my loop after the computation has happened for that iteration, I'll put something like
if iter <=2
bspace = [];
else
bspace = repmat('\b', [1 length(screenOut)]);
end
screenOut = sprintf(screenOutFormat, iter, estimatedValue);
fprintf([bspace screenOut]);
This way you get to see the starting point and each iteration without destroying your command window history.
2. Dynamic updates to a figure
This works well if you have something you can plot.
Before the loop begins, set up a plot with
figH = figure();
progPlot = plot(Y);
Then with each iteration you can do
progPlot.YData = Y;
drawnow();
This way you continue plotting the estimate you care about.
If you have a matrix that you care about, I'd recommend picking off the elements that you're really interested in and using #1. But if there's something more useful you can plot, #2 is usually more interesting to watch during long estimation/simulation routines.