isShuffleable - Determine whether datastore is shuffleable - MATLAB (original) (raw)

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Determine whether datastore is shuffleable

Syntax

Description

tf = isShuffleable([dst](#mw%5F6b4afc52-bb38-4cdd-b271-1b7cb804111a)) returns logical1 (true) if the datastore dst is shuffleable and logical 0 (false) otherwise.

You can use the shuffle function on shuffleable datastores to randomize the ordering of files while preserving the row associations of files in different datastores.

example

Examples

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When you have a matlab.io.datastore.SimulationDatastore object that contains big data from a simulation, you can determine the shuffleability of the SimulationDatastore using the isShuffleable function.

Log Big Data from Model

Open the example model sldemo _f uelsys.

mdl = "sldemo_fuelsys"; open_system(mdl)

Select Configuration Parameters > Data Import/Export > Log Dataset data to file. Alternatively, you can use the set_param function to log simulation data logged using the Dataset format to a MAT file instead of the workspace.

set_param(mdl,"LoggingToFile","on")

Simulate the model.

The MAT file out.mat appears in your current folder. Logged signal data is stored in the MAT file with the variable name sldemo_fuelsys_out.

Create a DatasetRef object that refers to the logged signal data.

DSRef = Simulink.SimulationData.DatasetRef("out.mat","sldemo_fuelsys_output");

Preview Big Data

Use curly braces to extract the signal named fuel, which is the tenth element in DSRef, as a Simulink.SimulationData.Signal object. The SimulationDatastore object exists in the Values property of the returned Signal object named SimDataSig.

SimDataSig = DSRef{10}; DStore = SimDataSig.Values;

Determine whether the datastore is shuffleable.

if isShuffleable(DStore) disp("Datastore is shuffleable.") else disp("Datatstore is not shuffleable.") end

Datatstore is not shuffleable.

Input Arguments

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Input datastore. You can use these datastores as input:

Version History

Introduced in R2020a

See Also

Objects

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