I was getting the same error and beacuse I was using the documentation link of other release. So can you make sure that you are using the documentation link of the same release of the MATLAB you have installed in your machine.
To find the documenation link for your release, refer to the following steps:
- Go to MathWorks homepage : https://uk.mathworks.com/
- Click on Documentation link under "Learn to Use" section at the bottom of the page.
- Click on the "Other Releases" link.
- This will take you to the Archived Documentation Link. https://uk.mathworks.com/help/doc-archives.html
- Select you release on this page.
- Search for "Replace a custom function with a Lookup table".
