need to plot value of tau for changing value of angles help

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Irenee 2014-4-6

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评论： Irenee 2014-4-7

clear % Homework D = diag(-rand(2,1)); % random diagonal matrix of 2 negatives eigenvalues v1 = rand(2,1); v2 = rand(2,1); %v1=v1/norm(v1); %v2=v2/norm(v2); V = [v1, v2]; r1=V(1,:); r2=V(2,:); %V = rand(2,2); % rotation matrix, the angle of rotation is pi/6 for k = 0:0.001:1/3 R = [cos(k*pi), -sin(k*pi); sin(k*pi), cos(k*pi)] k

       r11 = r1*R; 
       r22 = r2*inv(R);
       V1 = [r11;r22];

end %V1 = V*R A = V*D*inv(V); D1 = diag(-rand(2,1)); A1 = (V1)*(D1)*inv(V1); figure(1) p = (log(norm(inv(V)*V1)) + log(norm(inv(V1)*V)))/(-max(eig(A)) - max(eig(A1)))

plot(k,p) xlabel('k') ylabel('p')

can u help me to plot this ? the plot shows only a point in space thanks

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Answer 1

ragesh r menon 2014-4-7

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Here you are only storing last values of "k" and "p". And hence the plot shows a point. To modify the code, store value of k first. and the for loop should operate by calling "i". for example

    for i=1:length(k)
      R(i)=...
      r11(i)=..
      r22(i)=..
      V1(i)=...
    end.
this stores each of these values in an array and with these values you can find "p(i)"s. Now if you plot you should be able to meet your requirements