Error using plot Vectors must be the same lengths.

Question

Todd 2013-11-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/105532-error-using-plot-vectors-must-be-the-same-lengths

评论： Peyman 2014-3-16

So my code will run just fine when I first boot up MatLab. But if I try to run it again, I always get this message "Error using plot Vectors must be the same lengths." Is this a computer memory issue on my end or something?

MatLab Version: 8.1.0.604 (R2013a)

 t=[0 .3 .5 .75 .95 .99];
for i = 1:length(t)
    A = [0.0 0.0 .42;.6 0.0 0.0;0.0 0.75 t(i)];
    [v,lambda] = eig(A);
    lambdavector = max(lambda);
    for y = 1:length(lambdavector)
        if max(max(abs(lambda))) == abs(lambdavector(y))
            loc = y;
            deig = lambda(y,y);
        end
    end
    normv(:,i) = v(:,loc)/sum(v(:,loc));
 end
c = normv(1,:);
y = normv(2,:);
a = normv(3,:);
figure
plot(t,c,'b.-',t,y,'g.-',t,a,'r.-')
xlabel('Adult Survival Rate')
ylabel('Equilibrium Population')
title('Adult Survival Changed')
legend('Calves','Yearlings','Adults')

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Answer 1

Azzi Abdelmalek 2013-11-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/105532-error-using-plot-vectors-must-be-the-same-lengths#answer_114712

编辑：Azzi Abdelmalek 2013-11-10

在 MATLAB Online 中打开

Maybe some previous result are interfering with your code, try this

clear
t=[0 .3 .5 .75 .95 .99];
for i = 1:length(t)
  A = [0.0 0.0 .42;.6 0.0 0.0;0.0 0.75 t(i)];
  [v,lambda] = eig(A);
  lambdavector = max(lambda);
  for y = 1:numel(lambdavector)
      if max(abs(lambda(:))) == abs(lambdavector(y))
          loc = y;
          deig = lambda(y,y);
      end
  end
  normv(:,i) = v(:,loc)/sum(v(:,loc));
end
c = normv(1,:);
y = normv(2,:);
a = normv(3,:);
figure
plot(t,abs(c),'b.-',t,abs(y),'g.-',t,abs(a),'r.-')
xlabel('Adult Survival Rate')
ylabel('Equilibrium Population')
title('Adult Survival Changed')
legend('Calves','Yearlings','Adults')

Some of your data are complex numbers, I replaced them by their modulus

You can also replace max(max(A)) by max(A(:))

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Todd 2013-11-10

That worked thank you!

Peyman 2014-3-16

I had a similar issue. I ran the code after about a week and this error showed up. I just added "clear" at the beginning of each section of my code and it worked again.

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