"cycle for" between matrix with a variable in the name

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Andrea 2024-10-30，11:13

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https://ww2.mathworks.cn/matlabcentral/answers/2162995-cycle-for-between-matrix-with-a-variable-in-the-name

评论： Stephen23 2024-10-30，22:00

采纳的回答： Shivam

Hi;

I have a series of matrix like A1, A2....AN and i want to perform an operation like

for i=1:N

B=B+A"i"(:,2)

end

how do i have to format the A"i"(:,2) part?

thank you

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Steven Lord 2024-10-30，12:57

Can you dynamically create variables with numbered names like A1, A2, A3, etc.? Yes.

Should you do this? The general consensus is no. That Discussions post explains why this is generally discouraged and offers several alternative approaches.

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采纳的回答

Shivam 2024-10-30，11:27

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Hi Andrea,

Refer to the example implementation:

N = 5; % Example no of matrix
A = {A1, A2, A3, A4, A5}; % Cell array containing matrices
% Initialize B
B = zeros(size(A{1}, 1), 1); % Assuming all matrices have the same number of rows
% Perform the operation
for i = 1:N
    B = B + A{i}(:, 2);
end

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Voss 2024-10-30，14:34

在 MATLAB Online 中打开

A = zeros(size(B.C1,1),1);
for ii = 1:100
     A = A + B.("C"+ii)(:,12); 
end

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

Stephen23 2024-10-30，22:00

"...I am working with struct of the type B.C1, B.C2....B.C100"

Rather than forcing pseudo-indices into the fieldnames it would be simpler and more efficient to use actual indexing.

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