What's wrong with this code?

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Sam 2014-3-21

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关闭： MATLAB Answer Bot 2021-8-20

I am getting this error msg. Please find me the mistakes here.

In an assignment A(I) = B, the number of elements in B and I must be the same.

r=[2.0 3.1 3.5 3.65 3.84 3.95];

x=[];

x(1)=0.35;

f=@(x) r*x*(1-x);

N=40;

for t=1:N-1;

x(t+1)=f(x(t));

end

hold on

plot(x,'r-')

回答（2 个）

Joseph Cheng 2014-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/122605-what-s-wrong-with-this-code#answer_129626

yes thats because you are including information that is not here and in your other posting that was flagged. but looks like you have it so we're all set?

only rude comment from me would be that posting on a forum for assignment questions involving things besides what type of functions to use, function errors, random matlab issues, and approaches to handling data is cheating. The Teaching Assistant or office hours should be where assignment related questions be asked.

Star Strider 2014-3-21

And it’s not cheating to have MATLAB Answers do your homework for you?

Joseph Cheng 2014-3-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/122605-what-s-wrong-with-this-code#answer_129610

编辑：Joseph Cheng 2014-3-21

在 MATLAB Online 中打开

Were you attempting to do this?

r=[2.0 3.1 3.5 3.65 3.84 3.95];
x=[];
x(1,:)=0.35*ones(size(r));
f=@(x) r*x*(1-x);
N=40;
for t=1:N-1;
x(t+1,:)=f(x(t));
end
hold on
plot(x)
legend('r = 2.0','r = 3.1', 'r = 3.65')

Where the first value of x is 0.35? or you can re-write it such that the function

f=@(x,r) r*x*(1-x);

such that you write a for loop to cycle in the r you need.

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Sam 2014-3-21

Yes, but the graph I am getting for each individual r is completely different from when I use all the r values together if that make any sense to you.

Joseph Cheng 2014-3-21