How do I create such matrix ? (please look at the thread for further details)

Question

Derick Wong 2013-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/110189-how-do-i-create-such-matrix-please-look-at-the-thread-for-further-details

评论： Derick Wong 2013-12-19

采纳的回答： Jos (10584)

Hi,

Let say I have a matrix [ X1 X2 X3 X4 X5... Xm; Y1 Y2 Y3 Y4 Y5... Ym; Z1 Z2 Z3 Z4 Z5... Zm]

I need to use a method base on X1, X2 and X3 to get my new X4, X5 till Xm and same goes for Y and Z.

For X

The method in order to find X4 is X4=(X1+X2+X3)/3. Once X4 is calculated, we use the X4 to calculate X5 which now the it will turn out to be X5=(X2+X3+X4)/3 and find X6 using the found X5 and X4, X6=(X3+X4+X5)/3 and so on until we find Xm.

same goes for Y and Z.

My question is, how do we come out with such matrix if there is 93 rows and 343 column?

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Answer 1

Jos (10584) 2013-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/110189-how-do-i-create-such-matrix-please-look-at-the-thread-for-further-details#answer_118824

编辑：Jos (10584) 2013-12-19

在 MATLAB Online 中打开

So, the original values X4, X5 etc. are not used at all?

XYZ = ceil(10*rand(4,6)) % example data
RESULT = zeros(size(XYZ)) ; 
RESULT(:,[1 2 3]) = XYZ(:,[1 2 3])
M = size(XYZ,2) ;
for k = 4:M
   RESULT(:,k) = sum(RESULT(:,k-[1 2 3]),2)/3 
end