Please note that mask callbacks operate in the Base Workspace. The mask parameters, however, are stored in the mask workspace. This is why you see an error stating 'Undefined function or variable Table1', as the callback does not have access to the mask workspace.
To work around this, you would need to obtain the mask object and access the mask parameters within:
blkName = 'add_row_to_table_callback/Subsystem';
mask = Simulink.Mask.get(blkName);
You would then need to obtain the handle to the custom table in the mask and add the row as follows:
Table1 = mask.getDialogControl('Table1');
Table1.addRow("a","b","c","d");
Please run the below command in the command window of installed MATLAB R2019a version to get release specific documentation
>> web(fullfile(docroot, 'simulink/ug/control-custom-tables-programmatically.html'))
Please follow the below link to search for the required information regarding the current release:
