classdef MySignalMatFile < Simulink.io.FileType

methods
        
        function [didWrite,errMsg] = exportImpl(obj,fileName,cellOfVarNames, ...
                cellOfVarValues,isAppend)
            didWrite = false;
            errMsg = '';
            
            saveStruct = struct;
            
            for k = 1: length (cellOfVarNames)
                saveStruct.(cellOfVarNames{k}) = cellOfVarValues{k};
            end
            
            try
                if isAppend
                    save(fileName,'-struct','saveStruct','-append');
                else
                    save(fileName,'-struct','saveStruct');
                end
                didWrite = true;
            catch ME
                
                % Optional, return errMsg or throw hard error.
                % Returning an error message allows your automated
                % processes to carry on while allowing you to report the
                % error at a later time.
                errMsg = ME.message;
            end
            
        end
    end
end