abs — Absolute Value


\begin{rail} AbsoluteValue : 'abs' '(' ( Scalar \vert Matrix ) ')' ; \end{rail}
abs returns the absolute value of the argument. It operates element-by-element for a matrix argument, returning a matrix result. Absolute value is defined as

$\displaystyle \left\{\vphantom{ \begin{array}{ll} -x & \mbox{if $x < 0$\ and $... ...qrt{\Re(x)^{2} + \Im(x)^{2}} & \mbox{if $x$\ is complex} \end{array} }\right.$$\displaystyle \begin{array}{ll} -x & \mbox{if $x < 0$\ and $x$\ is real} \\ ... ...} \\ \sqrt{\Re(x)^{2} + \Im(x)^{2}} & \mbox{if $x$\ is complex} \end{array}$


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