Load timeseries data from workspace for non-periodic data

Question

Piotr Sawko 2024-1-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2068576-load-timeseries-data-from-workspace-for-non-periodic-data

评论： Jon 2024-1-11

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Paul 2024-1-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2068576-load-timeseries-data-from-workspace-for-non-periodic-data#answer_1387396

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 个评论
显示 -1更早的评论隐藏 -1更早的评论

Piotr Sawko 2024-1-11

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!

请先登录，再进行评论。

Answer 2

Jon 2024-1-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2068576-load-timeseries-data-from-workspace-for-non-periodic-data#answer_1387321

在 MATLAB Online 中打开

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 个评论
显示 3更早的评论隐藏 3更早的评论

Piotr Sawko 2024-1-11

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 2024-1-11

I understand. Glad you got an approach that will help you from @Paul

请先登录，再进行评论。