# Coding a Matrice in MathML by Stephen Bucaro

In MathML, coding a matrice is very similar to coding a table in HTML. So if understand HTML table code, MathML matrices will be easy for you. Unfortunately most people don't understand HTML table code. So lets go about it step-by-step.

A MathML matrice consists of a grid of boxes, each box created by a <mtd></mtd> element. The "td" stands for "table data". So within each mtd box is a single matrice number, variable, or expression element. The mtd boxes are inturn arranged in rows by nesting them inside <mtr></mtr> elements. The "tr" stands for "table row".

$\begin{array}{c}1\end{array}$
$<mtable> <mtr><mtd><mn>1</mn></mtd></mtr> </mtable>$


Shown above is the code for a minimal matrice, consisting of one row containing one matrice data element.

$\begin{array}{cc}1& 0\\ 0& 1\end{array}$
$<mtable> <mtr> <mtd><mn>1</mn></mtd><mtd><mn>0</mn></mtd> </mtr> <mtr> <mtd><mn>0</mn></mtd><mtd><mn>1</mn></mtd> </mtr> </mtable>$


Shown above is the code for a 2x2 matrice, consisting of 2 rows, each containing 2 matrice data elements.

$\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right]$
$<mo>[</mo> <mtable> <mtr> <mtd><mn>1</mn></mtd><mtd><mn>0</mn></mtd> </mtr> <mtr> <mtd><mn>0</mn></mtd><mtd><mn>1</mn></mtd> </mtr> </mtable> <mo>]</mo>$


By default an mtable element has no borders. So you'll need to next the mtable element within an <mo> element to display the desired brackets as shown above.