y=zerosphas(x,varargin)

function y=zerosphas(x,varargin)
% create a zero phasor matrix full of 0/_0 
% y=zerosphas(x,varargin)
% y=zerosphas(3) => 3x3 zero phasor matrix
% y=zerosphas(3,4) => creates 3x4 zero phasor matrix
% y=zerosphas([3 4]) creates a 3x4 zero phasor matrix
if nargin == 1
    if numel(x)==1 % simple nxn matrix 
        y=phasor(zeros(x),zeros(x));
    elseif numel(x)==2 % an nxm matrix  
        y=phasor(zeros(x(1),x(2)),zeros(x(1),x(2)));
    else
        error('X can only be 1 or 2 elements in length and scalar')
    end
elseif nargin==2
    if numel(x)==1 && numel(varargin{1})==1
        y=phasor(zeros(x,varargin{1}),zeros(x,varargin{1}));
    else
        error('Incorrect calling usage')
    end
end