During FFT analysis, Structure with Time and Signal options are not coming.

Structure with Time and Signal options are not coming even though in the model settings I have unselected the Signal simulation output option. The option starts from Dimension. Also in the logging section I have renamed the variable name and selected the Save format with Structure with time. What shall I do? I am in deperate need of help since I have and important test comming on the weedend where I will be asked to do multiple FFT analysis.

[Mathieu NOE]

well maybe it's because I haven't use Simulink for very long time, but for me , saving data to workspace is the job for a block "To Workspace" - and not just a Scope as your picture is telling me. maybe now Scopes can also be used to store data but that's new to me.

Don't you have access to the block "To Workspace" ??

[ankita]

I am new to MATLAB. Its been a year since I am working on it. So I am not sure wether there is the "To Workspace" block or not. But the Scopes are used to store data for any analysis. So maybe I would like you to elaborate the "To Workspace" block functions like how you used that to store datas, likewise I may try it.

[Mathieu NOE]

hello again

seems this block still exist

To Workspace

Answer 1

[Avni Agrawal]

Hi @ankita,

I understand that you are encountering issues with configuring your simulation model to output data in the "Structure with Time" format, which is crucial for performing FFT analysis.

Here are some steps you can take to troubleshoot and resolve the issue:

1. Verify Model Settings: Ensure "Signal logging" is enabled and "Structure with Time" is selected in the Save format.
2. Check Data Import/Export: Confirm the "Save to workspace" option is enabled and set to the correct format.
3. Update Model: Run a model update with `Ctrl+D` to apply changes.
4. Review Errors/Warnings: Check the MATLAB Command Window for any errors or warnings that might indicate issues.
5. Use Simulation Data Inspector: Verify data logging through the Simulation Data Inspector to ensure correct format.
6. Test with a Simple Model: Create a simple model to check if the issue is specific to your current setup.

Documentation References:

• MATLAB Signal Logging: https://www.mathworks.com/help/simulink/ug/logging-simulation-data.html
• Simulation Data Inspector: https://www.mathworks.com/help/simulink/ug/simulation-data-inspector.html
• Data Import/Export Configuration: https://www.mathworks.com/help/simulink/ug/configure-data-import-and-export.html

I hope this helps!