function deg = degree(x,y,z)
%DEGREE Polynomial degree
%
% DEG = DEGREE(p,x,flag,vector)
%
% p      : SDPVAR object.
% x      : Degree w.r.t linear SDPVAR objects.
% flag   : 'max', 'min'. Default 'max'
% vector : If vector = 1, returns degree of each element in p
%
% Examples
% x1 = sdpvar(1,1);x2 = sdpvar(1,1);
% p = [x1;x1*x2+x2^2];
%
% degree(p) returns 2
%
% degree(p,x1) returns 1
%
% degree(p,[x1 x2]) returns [1 2]
%
% degree(p,[x1 x2],'max',1) returns [1 0;1 2]
%
% degree(p,[],1) returns [1;2] 

if isa(x,'double')
    deg = 0;
else
    error('DEGREE only defined for SDPVAR and DOUBLE.');
end