Matrices in LaTeX: Row and Column Labelling

Question

So, I have an example matrix here:

\[
\begin{pmatrix}
t   & 1-t &  -1 &  0  &  0  \\
0   &  t  & 1-t &  -1 &  0  \\
0   &  0  &  t  & 1-t &  -1 \\
-1  &  0  &  0  &  t  & 1-t \\
1-t &  -1 &  0  &  0  &  t
\end{pmatrix}
\]

I wish to add labels to the columns and rows (such as a, b, c, d and the like) which go above and to the left (both outside) of the matrix, but are obviously aligned with said columns and rows.

How do I go about doing this?

Thanks for any potential help.

Answer 1

table or longtable environments could be used instead of pmatrix.

Answer 2

You need to use \bordermatrix. There's an example at http://www.math.harvard.edu/texman/node25.html.