signm matrix signum function

## Syntax

    X=signm(A)

## Arguments

А

  real or complex matrix

X

  real or complex matrix

## Description

For square and Hermitian matrices `X=signm(A)` is matrix signum function.

## Examples

    A=rand(4,4);
    B=A+A';
    X=signm(B);
    spec(B),spec(X)

## See also

- csgn
- sign