By default, Simulink® supports signals in the forms listed in Forms of Input Data. To
import file types containing signals that are not of the supported format, create and
register your own custom file type reader. Simulink supports custom file type readers written with
Simulink provides these file types.
Simulink.io.SignalBuilderSpreadsheet — Signal Builder file
Example file types
Creating a file reader requires you to be familiar with object-oriented programming. It is intended for an advanced audience.
To contain your package folders, create a folder and add that folder path to the MATLAB® path.
To that folder, add the custom file that contains your signals, such as
In that folder, create a
+Simulink folder, and inside that
folder, create a
Create a class that inherits from the
classdef MyFileType < Simulink.io.FileType
Save this class to
To register and interact with Signal Editor, implement these static methods:
Implement these public methods:
Check if your class is registered. In the Signal Editor tab, select Open > Import, and in the Import dialog box window, click Browse.
The custom file that contains your signals, such as
custompath/mySignals.mat, appears in
the file browser.
Select the custom file that contains your custom signals.
Return to the class file and implement these additional public methods:
To import the custom signals, use the
import(reader), where reader is
the file type object for the reader, specified as a
Simulink.io.FileType object. The output,
dataOnFile, is a structure with the fields
structure.Data, which is a cell array
of signals, and
structure.Name, which is a
cell array of the corresponding signal names. For example,
dataOnFile.Data is the cell array of
dataOnFile.Name contains the
corresponding signal names.
Return to the Signal Editor Open > Import and try to import again.
After you successfully import your custom signals, you can manipulate them in Signal
Editor. When done, and if you have implemented the
method, you can export the results by calling the
export method for
your reader at run time. Alternatively, you can use the export dialog from Export Signals to Custom Registered File Types.
For example implementations, see:
FileTypeObject for Use in Simulink
FileType object is a component you can use to create readers for
signals that exist in formats not currently supported in Simulink. Write the reader in MATLAB and use the Signal Editor Open > Import option to register the reader and import the custom format file.
Before importing, check that all editors for the custom file type class file are closed. Editing the custom file type class file while trying to import it as a reader causes unexpected behavior.
FileType object for use in Simulink. This example creates a reader for signals with a custom format.
Create a class definition text file to define your
On the first line of the class definition file, specify the name of your
FileType and subclass from
base class enables you to use all the basic
For your class:
Add the appropriate basic
FileType object methods to
register and interact with Signal Editor.
Validate the signal formats.
Determine the contents of the signal file.
Load variables from the signal file.
Import the signals.
See the reference pages for each method and the full class definition file
below for the implementation of each of these methods. To see the full class
definition for a custom signal reader, run: