plot of a cell array

HELLO there.

I want to get the plot of a cell but it appears to be empty plot could someone help me?

[DGM]

It might help if you posted the code you were trying to use. I'm not very good at guessing, and your screen is too far away for me to read.

[Nara Lee]

i have a 1*121 cell arrays each one has two components for example [1,2] and i just want the first one i mean 1

here is my code

for n = 1:121
 T1=[B(n) C(n);D(n) H(n)]
 T2=[R(n) G(n);E(n) L(n)]
 T{n}=T1*inv(T2);
 ei{n}=eig(T1*inv(T2));

[Walter Roberson]

You do not show us any attempt to plot.

Have you confirmed that you are not getting infinity or nan from your inv() ?

Why are you calculating T1*inv(T2) and assigning it to a variable, and then immediately calculating it again on the next line to take the eig of it?

Is there a good reason you are using T1*inv(T2) instead of using T1/T2 ?

[Nara Lee]

here T1 is something different from T2. they have different values.

i want T to be T1*inv(T2), coz my method define my code then next line i want eigen value of every square matrix

[Walter Roberson]

You have

T{n}=T1*inv(T2);

That is T1 on the left, and inv(T2) on the right.

On the next line you have

 ei{n}=eig(T1*inv(T2));

Inside the eig() you have T1*inv(T2) which is T1 on the left and T2 on the right, exactly the same as on the line above. Why did you not code

 ei{n} = eig(T{n});

??

And why did you use

 T1*inv(T2)
 

instead of

 T1/T2

?? Why are you using the less-accurate method of making that calculation? Do you have a special reason for deliberately reducing the accuracy of the calculation compared to T1/T2 ?

... And you still have not said anything about how you are doing the plotting, and whether you have confirmed that your results are finite.

[Nara Lee]

actually there is no difference between T1/T2 or T1*invT2 and no diff between ei{n}=eig(T{n}) and what i just wrote i really checked it.

and now i want plot from a cell

g{n}=log(ei{n})

im{n}=imag(g{n})

plot(im)

I know it would give me the plot but as i said i want just the first components of each cell be plotted.

there is a 1*121 cell that each cell has for example [2.34,0.3456]

[Walter Roberson]

im is a cell array that contains columns vectors of eigenvalues. What should the plot look like?

Answer 1

[Nara Lee]

this is im{n} and actually it gives me wrong answer it shouldn't be like this and if I do it just for one frequency it gives me same wrong answer