Create a matrix from another one with an history window of 3 columns

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Julien Benistant 2020-1-10

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评论： Julien Benistant 2020-1-13

Could someone help me with my problem.

I've got an original 2 by 25 matrix and I want to create a new 2 by 25 matrix with the same columns than the original one. But I want them reorganized such that a given column (:,n) in the new matrix is different from the columns (:,n:n+2) of the original matrix.

I've struggled to do that as Ifind a way using loops that need a lot of if statement to control for special cases... Is there someone with a simple(r) method to do that?

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Stephane Dauvillier 2020-1-13

OK? sorry I don't know what you mean

Julien Benistant 2020-1-13

Sorry I wasn't clear but I found a simple solution, I post it here in case of someone need help:

A= [1,3,5,7,8];

B = [4,12,20,28,32];

C = combvec(A,B);

S = randi([4 21],1);

V = [C(:,S:end), C(:,1:S-1)];

Basically I've just created a new matrix (V) randomly lagged (S) compared to the original one (C) !

Best,

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Stephane Dauvillier 2020-1-10

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You can try the function diff:

A = magic(5);
B = diff(A,[],2)

But B will have n-1 column what do you want for the extra column ?

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