|  | 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.x,p.y,[color '*']);
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							|  | else
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							|  |     plot(p.x,p.y,color);
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							|  | end
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							|  | if exist('P', 'var') && (~isempty(P))
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							|  |     gtsam.covarianceEllipse([p.x;p.y],P,color(1));
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							|  | end |