Nested loop results in 3d matrix and plot3

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Rajeev kamal
Rajeev kamal 2016-1-11
编辑： Rajeev kamal 2016-1-12
I am trying to run a nested loop to get three values saved as 3d matrix and then get a 3d plot from them. How can I do this. The values come from Xi+1 = r*Xi(1 − Xi), where i range from 1:50 and r from 2.4 to 4.
###Code####
r=2.4:0.1:4;
for j=1:16;
X(1,1)=.5;
xsav(1,1)=1;
xsav(1,2)=X(1);
r(j)=2.4+j*.1;
for i=1:50;
X(i+1)=r(j)*X(i)*(1-X(i));
end
end
How do I save these values and plot a 3d. (mesh or plot3 or comet3)
  1 个评论
Jason Nicholson
Jason Nicholson 2016-1-11
Your code and question are not easy to ready. You probably should try to make it look better.

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Geoff Hayes
Geoff Hayes 2016-1-12
Rajeev - why does your code define r as
r=2.4:0.1:4;
and then overwrite the jth element on each iteration of the outer for loop with
r(j)=2.4+j*.1;
This shouldn't be necessary since you have already defined r. As for saving the data to X, you can get a two-dimensional matrix/array as
r=2.4:0.1:4;
X = zeros(50,length(r));
for j=1:length(r)
X(1,j)=.5;
for i=1:size(X,1)-1
X(i+1,j)=r(j)*X(i,j)*(1-X(i,j));
end
end
In this case, X will be a 50x17 matrix. It isn't clear to me how you expect to get a 3D matrix from the above code, so please clarify.
As an aside, using i and j as your indexing variables is generally discouraged since MATLAB uses both to represent the imaginary number.
  1 个评论
Rajeev kamal
Rajeev kamal 2016-1-12
编辑：Rajeev kamal 2016-1-12
A 3d matrix was my misunderstanding. This works..Thanks @Geoff Hayes However, I wanted the values of r be included instead of 1 to 17

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