All input arguments must be tables. All tables being horizontally concatenated must have the same number of rows. All tables being horizontally concatenated must have the same number of rows. When concatenating cell arrays with tables, the cell arrays must have the same number of rows as the tables. All tables being horizontally concatenated must have the same row names. All tables being horizontally concatenated must have the same row times. A 0x0 timetable may not be concatenated with a non-0xN table. Convert all inputs to the same data type, change their order, or use JOIN. Timetables and tables may be concatenated only when the timetable is first. Convert all inputs to the same data type, change their order, or use JOIN. Timetables and cell arrays may be concatenated only when the timetable is first. Convert all inputs to the same data type, change their order, or use JOIN. Concatenating tables when the same custom property name is used as a per-table property in one table and a per-variable property in the other table is not supported.