Input multiple arrays into function

13 次查看（过去 30 天）
Fredrik Scheie
Fredrik Scheie 2022-5-2
评论： Fredrik Scheie 2022-5-3
I was wondering how to input several arrays into the function I have created? I am not very familiar with MATLAB. In python I would create a list of arrays and run the function in a for loop whereby appending the output to a new list. In MATLAB I understand it that the convention is to use cell arrays which can contain multiple arrays or other objects as I understand it? I tried running the following code, but I get an error. Here I want to input the matrices L2, L3 and get back a cell array of the corresponding output for each matrix.
L2 = [0 1/2 1/3 0 0 0 0;
1/3 0 0 0 1/2 0 0;
1/3 1/2 0 1 0 0 0;
1/3 0 1/3 0 1/2 0 0;
0 0 0 0 0 0 0;
0 0 1/3 0 0 1 0;
0 0 0 0 0 0 1];
L3 = [0,0,0,0,0;
1,0,0,0,0;
0,1,0,0,0;
0,0,1,0,0;
0,0,0,1,0];
d = sym('d');
Lists_mtxs = {L2, L3};
[Vs] = pagerank_function(Lists_mtxs,d);
Which calls the following function:
function [Vs] = pagerank_function(linkMatrix,d)
n = size(linkMatrix,1)
M = d * linkMatrix + (1-d)/n * ones(n)
% diagonal matrix eigenvalues D, eigenvectors mtx U
[U,D] = eig(vpa(M))
[d,ind] = sort(diag(D))
Ds = D(ind,ind)
Vs = V(:,ind)
end
  2 个评论
Torsten
Torsten 2022-5-2
How do you want to determine the zeros of a polynomial of order 7 where the coefficients depend on a symbolic variable ?
This command will not work:
[U,D] = eig(vpa(M))
And how do you want to sort symbolic roots ?
[d,ind] = sort(diag(D))
Fredrik Scheie
Fredrik Scheie 2022-5-3
Yes, the point here is to observe how the damping factor "d" here influences the calculated eigenvectors which I want to sort from smallest to largest. In that case its ok to end up with expressions for the eigenvectors where "d" is treated as a symbolic variable if I am understanding your question correctly?
[U,D] = eig(vpa(M)) - I used this because I wanted to normalize the eigenvectors in symbolic form. What should I use instead?
In terms of sorting the symbolic roots [d,ind] = sort(diag(D)) its really the eigenvectors which are important and the ones I want to return as an output, but I need to sort the eigenvalues such that they correspond with eigenvectors sorted from smallest to largest. Or do you mean sorting in terms of getting complex solutions when solving the characteristic polynomial? Not sure I understand.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Catalytic
Catalytic 2022-5-2
编辑：Catalytic 2022-5-2
Ran in:
Simpler example,
L2 = [0 1/2 1/3 0 0 0 0;
1/3 0 0 0 1/2 0 0;
1/3 1/2 0 1 0 0 0;
1/3 0 1/3 0 1/2 0 0;
0 0 0 0 0 0 0;
0 0 1/3 0 0 1 0;
0 0 0 0 0 0 1];
L3 = [0,0,0,0,0;
1,0,0,0,0;
0,1,0,0,0;
0,0,1,0,0;
0,0,0,1,0];
fun=@(L) 3*L; %multiply both matrices by 3
V=cellfun(fun,{L2,L3},'uni',0);
V{:}
ans = 7×7
0 1.5000 1.0000 0 0 0 0 1.0000 0 0 0 1.5000 0 0 1.0000 1.5000 0 3.0000 0 0 0 1.0000 0 1.0000 0 1.5000 0 0 0 0 0 0 0 0 0 0 0 1.0000 0 0 3.0000 0 0 0 0 0 0 0 3.0000
ans = 5×5
0 0 0 0 0 3 0 0 0 0 0 3 0 0 0 0 0 3 0 0 0 0 0 3 0

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息

标签

产品


版本

R2021b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by