function varargout = spy(X)
%SPY (overloaded)
if isa(X,'blkvar')
X = sdpvar(X);
end
Z = reshape(sum(abs(X.basis),2),X.dim(1),X.dim(2));
Z = Z~=0;
if nargout==0
spy(Z)
else
varargout{1}=Z;