To enter your matrix or vectors, you can use palettes or keyboard shortcuts.
To use palettes, right-click in the entry box and select the Matrix button:
(in a web browser), or open the Matrix palette (Maple and the Maple Player). Use the palette to enter your matrix (the process will be applied to the columns) or column vectors. When entering vectors, separate your vectors by commas: $\left[\begin{array}{c}1\\ 2\end{array}\right]$, $\left[\begin{array}{c}4\\ -1\end{array}\right]$
${}$
To enter vectors using the keyboard, use angle brackets to define your vector, and separate vectors by commas.
For example, enter <1,2>, <4,4> or <1,2,3>, <4,-1,2>, <11, 3/2, 0>
To enter a matrix using the keyboard, enter each column as a vector, separate columns by vertical bars, and encase the whole thing in angle brackets.
For example, to enter $\left[\begin{array}{cc}1& 3\\ -5& -1\end{array}\right]$, use: < <1, -5> | <3, -1> >.