function q = q2
% q2 is one of the three quaternion operators.
% q2 is usually denoted by j, but this symbol is used in Matlab to represent
% the complex operator (also represented by i).

% Copyright © 2005 Stephen J. Sangwine and Nicolas Le Bihan.
% See the file : Copyright.m for further details.

q = quaternion(0, 1, 0);

% Implementation note:  j cannot be overloaded because it is a built-in Matlab
% operator. J cannot be used because Matlab does not distinguish between upper
% and lower case.