How to create a sliding window function over column vector M

Question

Thashen Naidoo 2019-11-24

1
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https://ww2.mathworks.cn/matlabcentral/answers/492847-how-to-create-a-sliding-window-function-over-column-vector-m

编辑： Jeff 2024-2-8

If vector M is a column of 30000 points of temperature, How do I create a sliding window function that goes from 1 to 500, 2 to 501, 3 to 502 ...till the end. So the window length is 500.

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Answer 1

Thiago Henrique Gomes Lobato 2019-11-24

2
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https://ww2.mathworks.cn/matlabcentral/answers/492847-how-to-create-a-sliding-window-function-over-column-vector-m#answer_403038

在 MATLAB Online 中打开

You can easily implement a loop for this

A = [1,2,3,4,5,6]'; % Easy vector to verify output
fun = @(x)mean(x); % Your function
WindowLength = 2;
Output = zeros(length(A)-WindowLength,1);
for idx = 1:length(A)-WindowLength
    Block = A(idx:idx+WindowLength);
    Output(idx) = fun(Block);
end
Output
Output =
     2
     3
     4
     5

Or, if you want to have it in many places, just create a function for it:

     function output = SlideFun(x,WindowLength,fun)
     
         Output = zeros(length(x)-WindowLength,1);
    
        for idx = 1:length(x)-WindowLength
            Block = x(idx:idx+WindowLength);
            Output(idx) = fun(Block);
        end
     
     end