FigFormat property must be one of the values -1, 2 or 3. MatVersion property must be empty, ''-v6'', ''-v7'' or ''-v7.3''. RequiredMatlabVersion property must be a scalar integer with at least 5 digits. Format2Data property must contain a structure with the fields ''type'', ''handle'',, ''properties'', ''children'' and ''special''. Format3Data property must contain a row vector of figure handles. Filename must be a non-empty string scalar or a character vector. RequiredMatlabVersion property must be set to a value greater than zero before data can be written. FigFormat property must be one of the values 2 or 3 before data can be written.