Trying to run a script many times and combine all the results

I have a script which takes a random matrix does some calculations on it and then I am interested in looking at the eigenvalues. At the end of my script I get the eigenvalues using e=eig(A) but I want to run this 100s of times and collect and the eigenvalue to plot them on a graph.

I can write for k=1:100 but then e will only give me the eigenvalues for the last calculation as it overwrites e each time, so I think I'm looking for either a way of saying e_k=eig(A) so it will return e_1 e_2 .... or some way of combining them in the script itself so it automatically put them together.

[Stephen23]

"...so it will return e_1 e_2 ...."

Putting numbers into variable names is a sign that you are doing something wrong.

"..or some way of combining them ..."

Sure that is easy using indexing, either with a numeric array or a cell array: which class would you prefer the output to be?

[Danny]

I think I would be looking for a numeric array as what am I looking for is essentially just a list of all the eigenvalues together, I'm not worried about ordering them in any way.

Answer 1

[Jan]

eList = cell(1, 100);
for k = 1:100
    callYourScript;
    eList{k} = e;
end

A cell array is useful, if the elements, here e, have different sizes or types. If all e are vectors of the same length, a numerical array is usually more efficient:

eList = zeros(n, 100);  % where n is the length of e
for k = 1:100
    callYourScript;
    eList(:, k) = e;
end