Eigenwalker

Cleve Moler
/
Eigenwalker

on 11 Nov 2023

13
79
6
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1511

drawframe(1);

Write your drawframe function below

function drawframe(f)
% EIGENWALKER  Human gait
% Cleve's Corner, http://blogs.mathworks.com/cleve/2016/04/11.
    cla
    V = coefficients;
    X = reshape(V(:,1),15,3);
    L = {[1 5],[5 12],[2 3 4 5 6 7 8],[9 10 11 12 13 14 15]};
    p = zeros(1,4);
    for k = 1:4
       p(k) = line(X(L{k},1),X(L{k},2),X(L{k},3), ...
          'color',[0 2 3]/4, ......
          'marker','o','markersize',8, ...
          'linestyle','-','linewidth',1.5);
    end
    axis([-750 750 -750 750 0 1500])
    set(gca,'xtick',[],'ytick',[],'ztick',[])
    view(160,10)
    
    period = 151.5751;
    omega = 2*pi/period;
    fps = 48;
    dt = 2*pi/omega/fps;
    t = f*dt;
    c = [1 sin(omega*t) cos(omega*t) sin(2*omega*t) cos(2*omega*t)]';
    X = reshape(V*c,15,3);
    XH = [X(1,:); X(5,:)];
    set(p(1),'xdata',XH(:,1),'ydata',XH(:,2),'zdata',XH(:,3))
    for k = 2:4
         set(p(k),'xdata',X(L{k},1),'ydata',X(L{k},2),'zdata',X(L{k},3));
    end
    function V = coefficients 
    V = 0.1*[ ...
    5 -43 -182 0 1
    2064 14 -131 11 39
    2092 -215 -192 28 15
    1660 -72 -173 -1 3
    -7 -78 -173 2 1
    -1664 -79 -178 4 -3
    -2097 -246 -200 -28 -20
    -2016 -36 -168 -19 -49
    536 53 127 0 15
    794 11 83 -3 47
    931 -73 -145 1 -2
    20 -63 -113 1 0
    -883 -74 -146 1 -1
    -831 17 74 2 -47
    -567 61 125 0 -20
    205 -11 -4 -37 27
    500 -1010 -256 37 9
    -686 -606 -174 -11 17
    -59 -153 -52 -57 32
    -114 -7 -4 -62 35
    -177 139 44 -61 34
    -717 691 170 -12 16
    414 1174 254 36 0
    -544 2214 -576 327 -259
    859 1247 170 51 264
    -42 -10 -29 -115 80
    78 -10 0 -115 67
    -58 -10 33 -116 79
    832 -1240 -175 56 266
    -557 -2227 586 349 -271
    13837 1 0 70 86
    7695 -189 -11 124 6
    9721 61 44 82 59
    12251 -20 22 76 85
    12058 1 0 74 85
    12320 21 -23 78 82
    9774 -65 -39 83 49
    7766 224 17 119 -23
    984 -120 548 -105 266
    4122 250 49 123 30
    7897 -12 -31 70 84
    8766 1 1 70 87
    7889 13 32 70 86
    4157 -249 -52 124 35
    985 127 -548 -116 269];
    end 
end 