Mathematica 教程

# Typing Matrices

## Creating a New Matrix

Choose InsertTable/MatrixNew. Use the dialog box that pops up to create a matrix.

## Filling in Placeholders in a Matrix

Suppose the entry in the top-left position is selected.
Type an entry and select the next placeholder with the Tab key; repeat. (Use Shift+Tab to go backward.)
Type a, press Tab.
Type b, press Tab.
Type c, press Tab.
Press the Control key and the Space bar at the same time to get out of the grid.
Type d, press Ctrl+Space.
Move the insertion point to get out of the matrix.
Press RightArrow.

## Adding a New Column in a Matrix

Place the insertion point to the right of any entry; here the insertion point is to the right of the entry at the top left.
Place the insertion point.
Press the Control and Comma keys at the same time. A column of placeholders will appear, with the top one selected.
Press Ctrl+Comma.

## Adding a New Row in a Matrix

Place the insertion point to the right of any entry; here the insertion point is to the right of the entry at the top left.
Place the insertion point.
Press the Control and Enter keys at the same time. A row of placeholders will appear, with the first one selected.
Press Ctrl+Enter.