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Load timeseries data from workspace for non-periodic data

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Piotr Sawko
Piotr Sawko am 10 Jan. 2024
Kommentiert: Jon am 11 Jan. 2024
I want to load timeseries data from workspace to use as my model inputs. The data is a timeseries, but with points only at the times when the value changes (to make the files more managable - if I save all the samples, the files are huge even though the data is mostly invariant).
For examples:
ts.Time = [0 50]
ts.Data = [1 100]
What I want, is the input to be continuously 1 for times between 0 and 50, and then step change to 100 and continue at this value until the end of the simulation. This has to work irrespective of the simulation time step.
When I load the data and run the model, there only seems to be two choices:
1) If I tick the 'Interpolate data' box then for times when there isn't an exact match, the value of the input is interpolated between available samples. If you take my original example, between times 0 and 50 the input will slowly ramp at each simulation timestep instead of a step change at 50.
2) If I clear the 'Interpolate data' box then the value is only set when the simulation time matches the time value in the timeseries. For other times, the input is set to 0. Again, in my example the input shows two short blips at 0 and 50, but then inserts 0 for other timesteps.
Many thanks

Akzeptierte Antwort

Paul
Paul am 10 Jan. 2024
In the Model Configuration parameters,
change the Input field under Load From Workspace from ts to
addsample(ts,'Data',ts.Data(end),'Time',realmax)
assuming that ts is a timeseries object.
  1 Kommentar
Piotr Sawko
Piotr Sawko am 11 Jan. 2024
Thanks, that's a really neat solution.
For my case, it's still not 100% as I'm trying to map a MAT file containing the timeseries as an input to the Test Manager file. The timeseries object is buried inside a Simulink.SimulationData object, which adds a level of complication. But predominantly, I don't want the users to have to manually edit the 'Input string' after clicking 'Map Inputs'.
I'm just going to use the trick you've demonstrated to post process the data.
Many thanks!

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Weitere Antworten (1)

Jon
Jon am 10 Jan. 2024
I seem to be able to get the desired behavior using the following code to assign a structure, unchecking the interpolate box, and selecting the hold option for forming output after final value
ts.time = [0;50]
ts.signals.values = [1;100]
also works with ts as a time series
ts = timeseries([1 100],[0 50])
  5 Kommentare
Piotr Sawko
Piotr Sawko am 11 Jan. 2024
I don't want to use 'From Workspace', as I'm adding functionality to an existing workflow which uses Test Manager and mapping of MAT files as an input for tests. If I was to use From Workspace, I'd need to restructure the test harness models which then has impact on other things.
Jon
Jon am 11 Jan. 2024
I understand. Glad you got an approach that will help you from @Paul

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