function s = signum (x)
%SIGNUM compute and display the sign of a column vector x
% Example
%   s = signum(x)
% See also: testall

%   Copyright 2006, Timothy A. Davis.
%   http://www.cise.ufl.edu/research/sparse

s = ones (length (x),1) ;
s (find (x < 0)) = -1 ;	    %#ok
disp ('s =') ;
disp (s) ;