Trace

The trace of an n×n matrix is the sum of the diagonal elements. This operation applies to square matrices only.

$\blacktriangleright$ To compute the trace of a square matrix

1.
Place the insertion point in the matrix.

2.
From the Matrices submenu, choose Trace.

$\blacktriangleright$ Trace

$\left(\vphantom{
\begin{array}{cc}
a & b \\
c & d
\end{array}
}\right.$$\begin{array}{cc}
a & b \\
c & d
\end{array}$$\left.\vphantom{
\begin{array}{cc}
a & b \\
c & d
\end{array}
}\right)$, trace: a + d

$\left(\vphantom{
\begin{array}{ccc}
-85 & -55 & -37 \\
-35 & 97 & 50 \\
79 & 56 & 49
\end{array}
}\right.$$\begin{array}{ccc}
-85 & -55 & -37 \\
-35 & 97 & 50 \\
79 & 56 & 49
\end{array}$$\left.\vphantom{
\begin{array}{ccc}
-85 & -55 & -37 \\
-35 & 97 & 50 \\
79 & 56 & 49
\end{array}
}\right)$, trace: 61