Note: click with the right mouse button on any WebEQ equation to bring up a font size control panel.

Arrays

X = \left ( \array{1 & x \\ 0 & 1} \right )

The array option \collayout is used to line up the columns.

f(x) = \left \{

\array{\arrayopts{\colalign{left center left}}

       0 & \text{when} & x < 0 \\
     x^2 & \text{when} & x \geq 0
      }
\right

Here, two nested arrays are used to create a block matrix. Note how the vertical and horizontal dotted lines are specified.

M = \left [
    \array{\arrayopts{\colalign{center center}
                      \collines{dashed}
                      \rowlines{dashed}       }

\array{1 & x_1 & \cdots & x_1^n \\
       1 & x_2 & \cdots & x_2^n \\
       \vdots & & & \vdots \\
       1 & x_n & \cdots & x_n^n}          & 0 \\

                             0            & 1}
    \right ]

More information on these commands may be found in Sec. 7.3 of the WebTeX documentation.

WebEQ 2.5 Documentation Table of Contents