|  | function plotPoint2(p,color,P)
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							|  | % plotPoint2 shows a Point2, possibly with covariance matrix
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							|  | if size(color,2)==1
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							|  |     plot(p(1),p(2),[color '*']);
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							|  | else
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							|  |     plot(p(1),p(2),color);
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							|  | end
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							|  | if exist('P', 'var') && (~isempty(P))
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							|  |     gtsam.covarianceEllipse([p(1);p(2)],P,color(1));
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							|  | end |