The matrix command allows you to lay out equation objects in an automatically sized matrix layout. Matrix brackets are automatically added to your result
The matrixc, matrixl and matrixr commands allow you to set the alignment of a grid by command.
matrix(1&2&3\\4&5&6\\7&8&9)
The matrix command is used in exactly the same way as the table command. The only difference is that tables are drawn with lines marking the individual cells. Visit the table command page for more details.