function y = lt(X,Y)
%LT (overloaded)
if isa(X,'ndsdpvar')
X = sdpvar(X);
elseif isa(X,'double')
X = X(:);
end
if isa(Y,'ndsdpvar')
Y = sdpvar(Y);
elseif isa(Y,'double')
Y = Y(:);
try
y = constraint(X,'<',Y);
catch
error(lasterr)