angle.m

这是支持在MATLAB中进行四元数（哈密顿数）的工具箱

function theta = angle(q, a)
% ANGLE or phase of quaternion.
% (Quaternion overloading of standard Matlab function.)
%
% The second parameter is optional. If omitted, the result will always be
% in the range (0, pi), that is, the quaternion q is regarded as being in
% the upper half of a complex plane defined by the axis of q. A reference
% unit quaternion defining the direction of the positive imaginary axis of
% q may be supplied as the second parameter, in which case the result may
% be in the full range from -pi to +pi.
%
% The optional argument must be either the same size as q or be a scalar
% (in which case the same value is used for all elements of q).

% Copyright