How to divide a signal into windows using loops

Question

Mohamed Medhat 2021-1-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/719390-how-to-divide-a-signal-into-windows-using-loops

编辑： Adam Danz 2021-1-18

i have a signal y which is 11439 long supposing it is y=randn(1,11439) which I want to divide into windows of lengths [16,64,256,1024,4096] where each window overlaps with 50% of the previous window

using 16 as an example I want the whole signal to be divided to windows of length 16 where each window overlaps with the previous by 50% like 1:16 then 8:24 and store each window

how can I implement that using a for loop or if statement

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Answer 1

Adam Danz 2021-1-17

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/719390-how-to-divide-a-signal-into-windows-using-loops#answer_599955

编辑：Adam Danz 2021-1-18

在 MATLAB Online 中打开

 y=randi(100,1,11439); % Integers used for easy comparison
 n = 16;  % must be even
 windowStart = [1, n/2+1:n/2:numel(y)]; 
 windowStop = n:n/2:numel(y);  
 
 nColumns = floor(numel(y)/(n/2))-1; 
 ym = nan(nColumns,n);
 for i = 1:nColumns
     ym(i,:) = y(windowStart(i):windowStop(i));
 end 

View results; you can see columns 9:16 of row n match columns 1:8 for row n+1.

 ym(1:4,:)
ans = 4×16
    63    73    82    27     3    25    35    41    33    48    76    80     5    40    54    21
    33    48    76    80     5    40    54    21    39    93    98    59    37    92    74     2
    39    93    98    59    37    92    74     2    62    34    47    39    39    87    51   100
    62    34    47    39    39    87    51   100     9    70     9    76    99    47    92    59

Any trailing values of y that didn't fit into the last window are ignored.