How can I create a matrix with combination of some other matrix elemenst dynamicaly in a loop

Question

Ehsan M 2019-7-16

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编辑： Ehsan M 2019-7-16

采纳的回答： Bruno Luong

Dear Friends

Need an emergency help. it is a pleasure to get any ideas to solve the problem.

discription:

I have a dynamic code which generate some vectors with different size of members like bellow:

The counter is vary from 2 to a unknown value

in loop 1, I have V1, V2 where V1=( 1 2 3), V2=(4, 5)

and Now I want to create a matrix M=[ 1 4;1 5; 2 4; 2 5; 3 4; 3 5]

in the loop 2 the other vector as V3 =(6 7 8) is added to the sysytem and now I want new

M=[ 1 4 6;

1 4 7;

1 4 8;

1 5 6;

1 5 7;

....

3 5 7;

3 5 8]

In the next loop V4 is generrate and if V4=( 9 10) new M should be the combination of all elements of V1, V2, V3, V4

M=[ 1 4 6 9;

1 4 6 10 ;

....]

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madhan ravi 2019-7-16

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Answer 1

Bruno Luong 2019-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/471867-how-can-i-create-a-matrix-with-combination-of-some-other-matrix-elemenst-dynamicaly-in-a-loop#answer_383344

编辑：Bruno Luong 2019-7-16

在 MATLAB Online 中打开

V = {[1 2 3] [4 5] [6 7 8] [9 10]};
M = zeros(1,0);
n = cell(0);
for k=1:length(V)
    Vk = V{k}; % replace by your dynamic generation
    Vk = Vk(:);
    m = size(M,1);
    n{k} = 1;
    n{1} = size(Vk,1);
    M = [repelem(M, n{:}), repmat(Vk,[m 1])];
    % do something with the updated M ...
    M
end