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This function shuffles examples and class values from an ENVIExamples object in order to create a random distribution of training data used for classification. Random ordering of the examples is important if the examples are split into multiple sets (such as training and evaluation sets).

The following diagrams show typical workflows where this function is used:




See Define, Train, and Run the Classifier.


Result = ENVIShuffleExamples(Examples [, Keywords=value])

Return Value

This function returns a reference to a shuffled ENVIExamples object.



Specify an input ENVIExamples object.


ERROR (optional)

Set this keyword to a named variable that will contain any error message issued during execution of this routine. If no error occurs, the ERROR variable will be set to a null string (''). If an error occurs and the routine is a function, then the function result will be undefined.

When this keyword is not set and an error occurs, ENVI returns to the caller and execution halts. In this case, the error message is contained within !ERROR_STATE and can be caught using IDL's CATCH routine. See IDL Help for more information on !ERROR_STATE and CATCH.

See Manage Errors for more information on error handling in ENVI programming.

SEED (optional)

If repeatability is desired (such as for testing), set this input variable to specify the initial seed value on randomization. See the Seed argument in the IDL RANDOMU help topic for details on its use.

Version History

ENVI 5.4


API Version


See Also

ENVIShuffleExamplesTask, ENVIExamples


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