Using Simulink

Creating Custom Simulation Error Messages

The Simulink Diagnostic Viewer displays the output of any instance of the MATLAB error function executed during a simulation, including instances invoked by block or model callbacks or S-functions that you create or that are executed by the MATLAB Function block. Thus, you can use the MATLAB error function in callbacks and S-functions or in the MATLAB Function block to create simulation error messages specific to your application.

For example, in the following model,

the MATLAB Fcn block invokes the following function

• function y=check_signal(x)
    if x<0 
      error('Signal is negative.');
    else
      y=x;
    end
  

Executing this model displays an error message in the Simulation Diagnostic Viewer:

Including Hyperlinks in Error Messages

You can include hyperlinks to blocks, text files, and directories.

Object Links.   To include a hyperlink to a block, path, or directory, include the item's path in the error message enclosed in quotation marks, e.g.,

• error ('Error evaluating parameter in block "mymodel/Mu"')

• displays a text hyperlink to the block Mu in the current model in the error message. Clicking the hyperlink displays the block in the model window.

• error ('Error reading data from"c:/work/test.data"')

• displays a text hyperlink to the file test.data in the error message. Clicking the link displays the file in your preferred MATLAB editor.

• error ('Could not find data in directory "c:/work"')

• displays a text hyperlink to the c:/work directory. Clicking the link opens a system command window (shell) and sets its working directory to c:/work.

Note    The text hyperlink is enabled only if the corresponding block exists in the current model or if the corresponding file or directory exists on the user's system.

Diagnosing Simulation Errors

Improving Simulation Performance and Accuracy