How to pick data with fix moving window ?

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aa
aa 2021-1-6
评论： Mathieu NOE 2021-1-6
Hi everyone,
May someone help me here...
I have a 366 data points. I am interested to pick 60 data points each time with a shift of 5 data points i.e. 1-60, 5-65, 10-70, 15-75 ..... 305-365.
Thank you.

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回答（1 个）

Mathieu NOE
Mathieu NOE 2021-1-6
hello
create index vector with delta = 5 :
ind = min(data):5:max(data);
and use it to extract the corresponding data values :
data_out = data(ind);
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Mathieu NOE
Mathieu NOE 2021-1-6
ok
i read your first request a bit too quickly !
I was about to send the code when I noticed that the way you split the data cannot give the same 60 points for all cases :
1-60 => length = 60
5-65 and al followers => length = 61
so we have to change either the lower or the upper limit (like 5-64 and not 5-65)
Mathieu NOE
Mathieu NOE 2021-1-6
so code should be :
data = readmatrix('data.txt');
buffer_length = 60;
k = 5;
nb_loops = 1+fix((length(data)-buffer_length)/k);
% nb_loops = 62;
data_out = [];
for ci = 1:nb_loops
ind_start = 1+(ci-1)*k;
ind_stop = ind_start+buffer_length-1;
ind = ind_start:1:ind_stop;
data_out(:,ci) = data(ind);
end

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