Matrices

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Matrices

The array environment is like L^ATEX's tabular environment except that each element is in math mode. The number and alignment of columns is controlled by the arguments - use l, c or r to represent each column with either left, center or right alignment. The default font style used is \textstyle but you can override this by changing the \displaystyle.

\begin{math}
\begin{array}{clrr} %
      a+b+c & uv & x-y & 27 \\
       x+y  & w  & +z  & 363 
\end{array}
\end{math}

produces $\begin{array}{clrr} a+b+c & uv & x-y & 27 \\ x+y & w & +z & 363 \end{array}$

The rows are arranged so that their centres are aligned. You can align their tops or bottoms instead by using a further argument when you create the array.

\begin{array}{clrr}[t]

would produce top-aligned lines, and `[b]' would produce bottom-aligned ones. The Delimiters section of this document shows how to bracket matrices.

TEX has a few maths facilities not mentioned in the L^ATEX book. The following TEX construction might be useful.

\begin{math}
\bordermatrix{&a_1&a_2&...&a_n\cr
          b_1 & 1.2  & 3.3  & 5.1  & 2.8  \cr
          c_1 & 4.7  & 7.8  & 2.4  & 1.9  \cr
          ... & ...  & ...  & ...  & ...  \cr
          z_1 & 8.0  & 9.9  & 0.9  & 9.99  \cr}
\end{math}

$\bordermatrix{&a_1&a_2&...&a_n\cr b_1 & 1.2 & 3.3 & 5.1 & 2.8 \cr c_1 & 4.7 &... ...4 & 1.9 \cr ... & ... & ... & ... & ... \cr z_1 & 8.0 & 9.9 & 0.9 & 9.99 \cr}$

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