Open the Times Table App project. Use currentProject to create a project object from the currently loaded project.

matlab.project.example.timesTable
proj = currentProject;

Get a file by name.

myfile = findFile(proj,"source/timesTableGame.m")

mmyfile = 

  ProjectFile with properties:

                   Path: "C:\myProjects\examples\TimesTableApp\source\timesTableGame.m"
                 Labels: [1×1 matlab.project.Label]
               Revision: "286043ae7ee557100902fb645a6c97eca5d50472"
    SourceControlStatus: Unmodified

View the existing label by getting the Labels property of the file.

myfile.Labels

ans = 

  Label with properties:

            File: "C:\myProjects\examples\TimesTableApp\source\timesTableGame.m"
        DataType: 'none'
            Data: []
            Name: "Design"
    CategoryName: "Classification"

Attach the label "Artifact" to the file in the category "Classification".

addLabel(myfile,"Classification","Artifact")

ans = 

  Label with properties:

            File: "C:\myProjects\examples\TimesTableApp\source\timesTableGame.m"
        DataType: 'none'
            Data: []
            Name: "Artifact"
    CategoryName: "Classification"

There are now two labels, the original one and the added one. To view just the added one, index into the Labels property.

reviewlabel = myfile.Labels(1)

reviewlabel = 

  Label with properties:

            File: "C:\myProjects\examples\TimesTableApp\source\timesTableGame.m"
        DataType: 'none'
            Data: []
            Name: "Artifact"
    CategoryName: "Classification"

Detach the new label from the file. The file now only has one label.

removeLabel(myfile,reviewlabel)
myfile

myfile = 

  ProjectFile with properties:

                   Path: "C:\myProjects\examples\TimesTableApp\source\timesTableGame.m"
                 Labels: [1×0 matlab.project.Label]
               Revision: "286043ae7ee557100902fb645a6c97eca5d50472"
    SourceControlStatus: Unmodified

Open the Times Table App project. Use currentProject to create a project object from the currently loaded project.

matlab.project.example.timesTable
proj = currentProject;

Get the list of files.

files = proj.Files;

Loop through each file. To get just the file extension, use the fileparts function and take the last part. If a file has the extension .m, attach the label "Utility".

for fileIndex = 1:numel(files)
   file = files(fileIndex);
   [~, ~, fileExtension] = fileparts(file.Path);
   if strcmp(fileExtension,".m")
       addLabel(file,"Classification","Utility");
   end
end

In the project Files view, the Classification column displays the label Utility for each .m file in the utilities folder.

Open the Times Table App project. Use currentProject to create a project object from the currently loaded project.

matlab.project.example.timesTable
proj = currentProject;

Create a new category "Review".

createCategory(proj,"Review","char");

For the new category, create a label "To Review".

reviewCategory = findCategory(proj,"Review");
createLabel(reviewCategory,"To Review");

Get a file by name.

myfile = findFile(proj,"source/timesTableGame.m")

myfile = 

  ProjectFile with properties:

                   Path: "C:\myProjects\examples\TimesTableApp\source\timesTableGame.m"
                 Labels: [1×1 matlab.project.Label]
               Revision: "c7603d5dd71a40484974c3f1c45d839819b7b061"
    SourceControlStatus: Unmodified

Attach the label "To Review" and a character vector of label data to the file.

addLabel(myfile,"Review","To Review","Whole team design review")

ans = 

  Label with properties:

            File: "C:\myProjects\examples\TimesTableApp\source\timesTableGame.m"
        DataType: 'char'
            Data: 'Whole team design review'
            Name: "To Review"
    CategoryName: "Review"

In the project Files view, for the timesTableGame.m file, the Review column displays the To Review label with label data.

Alternatively, you can set or change label data using the Data property.

mylabel = myfile.Labels(1);
mylabel.Data = "Final review";