Line | |
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1 | function h = draw_ellipse(x, c, outline_color, fill_color) |
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2 | % DRAW_ELLIPSE(x, c, outline_color, fill_color) |
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3 | % Draws ellipses at centers x with covariance matrix c. |
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4 | % x is a matrix of columns. c is a positive definite matrix. |
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5 | % outline_color and fill_color are optional. |
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6 | |
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7 | n = 40; % resolution |
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8 | radians = [0:(2*pi)/(n-1):2*pi]; |
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9 | unitC = [sin(radians); cos(radians)]; |
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10 | r = chol(c)'; |
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11 | |
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12 | if nargin < 3 |
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13 | outline_color = 'g'; |
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14 | end |
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15 | |
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16 | h = []; |
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17 | for i=1:cols(x) |
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18 | y = r*unitC + repmat(x(:, i), 1, n); |
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19 | if nargin < 4 |
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20 | h = [h line(y(1,:), y(2,:), 'Color', outline_color)]; |
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21 | else |
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22 | h = [h fill(y(1,:), y(2,:), fill_color, 'EdgeColor', outline_color)]; |
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23 | end |
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24 | end |
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