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Class: io.reader
Package: io

Return all readers available to import file

Since R2020b


readers = io.reader.getSupportedReadersForFile(filename)


readers = io.reader.getSupportedReadersForFile(filename) returns all readers in the Simulation Data Inspector that support importing the file specified by filename.

Input Arguments

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Name of or path to file to import, specified as a character array or string.

Example: 'MyDataFile.csv'

Data Types: char | string

Output Arguments

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File readers available to import file, returned as an array of strings. When the Simulation Data Inspector has a built-in reader for the file, the array contains "built-in".



To learn about attributes of methods, see Method Attributes.


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This example shows how to register a custom file reader with the Simulation Data Inspector, verify registration was successful, and unregister a file reader.

Register the Custom File Reader

This example registers the file reader ExcelFirstColumnTime. For an example that shows how to author the custom file reader, see Import Data Using a Custom File Reader. As the name suggests, the custom file reader for this example supports Microsoft Excel™ files. Register the reader for the .xlsx and .xls extensions.

registerFileReader(ExcelFirstColumnTimeReader, [".xlsx" ".xls"]);

Verify Custom Reader Registration

To verify registration of a custom reader, you can use the io.reader.getRegisteredFileReaders method or the io.reader.getSupportedReadersForFile method.

The io.reader.getRegisteredFileReaders returns a string array that contains the names of all registered custom file readers.

ans = 

You can also use the io.reader.getSupportedReadersForFile method to see all reader options for a specific file. The built-in option in the returned string array indicates that the Simulation Data Inspector has a built-in Excel file reader.

ans = 1x2 string
    "ExcelFirstColumnTimeReader"    "built-in"

Unregister a Custom File Reader

To unregister a custom file reader, use the unregisterFileReader method. All custom readers are unregistered when you close a MATLAB™ session.

unregisterFileReader(ExcelFirstColumnTimeReader, [".xlsx" ".xls"])

Version History

Introduced in R2020b