Line | |
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1 | function h = draw_ellipse_axes(x, c, linespec) |
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2 | % DRAW_ELLIPSE_AXES(x, c, linespec) |
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3 | % Draws the major and minor axes of ellipses. |
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4 | % Ellipses are centered at x with covariance matrix c. |
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5 | % x is a matrix of columns. c is a positive definite matrix. |
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6 | % linespec is optional. |
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7 | |
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8 | [v,e] = eig(c); |
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9 | v = v*sqrt(e); |
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10 | |
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11 | h = []; |
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12 | for j = 1:cols(v) |
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13 | x1 = repmat(x(1,:),2,1) + repmat([-1;1]*v(1,j),1,cols(x)); |
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14 | x2 = repmat(x(2,:),2,1) + repmat([-1;1]*v(2,j),1,cols(x)); |
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15 | h = [h line(x1,x2)]; |
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16 | end |
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17 | if nargin > 2 |
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18 | set_linespec(h,linespec); |
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19 | end |
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