@-folder and functionSignatures.json

Hi everyone.

I have a classdef file in a certain @-folder. In the same folder I put the folder "resources" containing the "functionSignatures.json" file for the class object I created. Unfortunately when I try to use the autocompletion with an instance of the class object, I don't get any suggestion at all, as if Matlab doesn't find the corresponding functionSignatures.json file.

Example

@MyClass/MyClass.m

@MyClass/resources/functionSignatures.json (containing the function signatures for MyClass.m

but when i type "MyClass(' " and press "tab" I don't get any completions.

If I put the MyClass.m and functionSignature.json file in a NOT @-folder everything works fine.

Any suggestion?

Answer 1

[per isakson]

The R2019b doc Customize Code Suggestions and Completions says "For MATLAB to detect the function signature information, you must place functionSignatures.json in the folder that contains the function code."

I failed to find reference to a folder named "resources". Could it differ between releases?

Interpreting the documentation is sometimes tricky, because the text describes only the basic case.

I made the following two clips from my R2018a installation.

Proposal: try with functionSignature.json in the same folder as the folder @MyClass.

[Edoardo Ferocino]

Thanks per isakson, this solved the issue!

FYI, the "resources" folder is something I assumed necessary having a look at built-in functions signatures. For example, the functionSignature.json file for the "figure" function is under matlabroot\toolbox\matlab\graphics\resources. But maybe is for a different reason.

Thanks

Answer 2

[Ken Atwell]

The documentation was improved for the R2020a release to clarify the location for class method JSON definitions; see the first few paragraphs of:

https://www.mathworks.com/help/matlab/matlab_prog/customize-code-suggestions-and-completions.html

You would want to place your functionSignatures.json file in the parent folder of @MyClass