ABS function
Description
Absolute value. ABS(x) returns the absolute value of the number x.
$$ |x| = \begin{cases} x, & \mbox{if } x \ge 0 \\ -x, & \mbox{if } x < 0 \end{cases} $$
$$ |x| = \begin{cases} x, & \mbox{if } x \ge 0 \\ -x, & \mbox{if } x < 0 \end{cases} $$ Examples
ABS(-5) equals 5
ABS(5) equals 5
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