# How to create a labelled matrix in LaTeX?

• LaTeX
Hi

does anybody know how to create a labelled matrix in LaTeX? By which I mean something like this:
a b
a [ 1 0 ]
b [ 0 1 ]

Where the inner elements are within the braces, but there are tabular label elements for the rows and columns (a and b). Cant get it too look right!

Cheers

alphysicist
Homework Helper
Hi rwinston,

If you don't mind parenthesis instead of braces you can use bordermatrix from plain TeX:

$$\bordermatrix{&a_1&a_2& a_3 \cr b_1 & 1 & 2 & 3 \cr b_2 & 2 & 3 & 4 \cr b_3 & 3 & 4 & 5 \cr}$$

$$\bordermatrix{&a_1&a_2\cr b_1 & 1 & 2 \cr b_2 & 2 & 3 \cr}$$

$$\bordermatrix{&a_1&a_2 \cr b_1 & 1 & 2 \cr b_2 & 2 & 3 \cr b_3 & 3 & 4 \cr}$$

There is also a newer kbordermatrix package that you can use that gives more options (such as being able to change the delimiters).

Thanks! Thats exactly what I need!