MATLAB: Select a point in Scope Graph

magnitude

How do I select a point in the graph generated using the scope? I want to know the magnitude of the graph.

Best Answer

For what I can see you can't do it directly in the scope (matlab 2008b), some options:

#1 Export the signals to matlab and analyse them in there, you can save the scope data in a scope option or use the To Worspace block.

#2 Using the MinMax Running Resettable you can see the magnitude max and min of your signal, send the output of that block to one display block.

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MATLAB: How to plot struct data

The simout structure has simout.signals, simout.time and simout.blockName fields. The simout.signals field also has a simout.signals.values field, which holds your sampled data.

Further, if you selected 'Structure With Time' in your 'To Workspace' block, then the time field will be populated and the easiest way to plot it is like this:

>> plot(simout.time,simout.signals.values)

Otherwise, simout.time is left empty and you should just use the tout vector for your time variable like this:

>> plot(tout,simout.signals.values)

MATLAB: Simulink to matlab results display

Export the signals from Simulink by using the 'To Workspace' block. Set the save format as 'Structure With Time'. In Matlab you can then plot the data using the plot command:

    plot(simout.time, simout.signals.values);

However, if you have muxed multiple signals together (such as the four in the attached image), you can use subplot to show all the various signals individually. For example:

subplot(4,1,1)
plot(simout.time, simout.signals.values(:,1));
subplot(4,1,2)
plot(simout.time, simout.signals.values(:,2));
subplot(4,1,3)
plot(simout.time, simout.signals.values(:,3));
subplot(4,1,4)
plot(simout.time, simout.signals.values(:,4));

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MATLAB: How to plot struct data

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