Difference between revisions of "Signum"

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The signum function (also called the sign function) is the function
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The signum function $\mathrm{sgn} \colon \mathbb{R} \rightarrow \{-1,0,1\}$ (also called the sign function) is the function
 
$$\mathrm{sgn}(x)=\left\{ \begin{array}{ll}
 
$$\mathrm{sgn}(x)=\left\{ \begin{array}{ll}
 
1, & x > 0 \\
 
1, & x > 0 \\

Revision as of 08:03, 16 June 2016

The signum function $\mathrm{sgn} \colon \mathbb{R} \rightarrow \{-1,0,1\}$ (also called the sign function) is the function $$\mathrm{sgn}(x)=\left\{ \begin{array}{ll} 1, & x > 0 \\ 0, & x = 0 \\ -1, & x < 0 \end{array} \right.$$