apply function to a moving window over a vector (v5, jan 2018)
Updated 29 Jan 2018

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R = SLIDEFUN(FUN, W, V) evaluates the function FUN to a moving window of W consecutive elements of the vector V.
The function FUN is specified by a function handle or a function name and should return a scalar for a vector input. W specifies the size of the window and should be a positive integer. At the two edges of the vector less than W elements will be used. R will have the same size as V.
Effectively SLIDEFUN applies the function FUN to a moving window of consecutive elemens V(x0:(x0+W)) using FEVAL, and returns the result in R(x).
The window [x0:(x0+W)] is relative to the current point x in V. R = SLIDEFUN(FUN, W, V, WINDOWMODE) denotes the type of windowing being used: central (default), backward and forward.

R = SLIDEFUN(FUN,W,V,WINDOWMODE, P1,P2,...) provides for aditional parameters which are passed to the function FUN.

Example 1) Sliding max filter - return the maximum of every three consecutive elements:
V = [1 2 3 9 4 2 1 1 5 6] ;
R = slidefun(@max, 3, V)
% -> [2 3 9 9 9 4 2 5 6 6]
% So R(i) = max(R(i-1:i+1)) ;
% and R(1) = max(V(1:2))
More examples are provided in the help section.

Part of it's functionality has been implemented in base matlab (e.g. by movsum, movmean)

Cite As

Jos (10584) (2024). slidefun (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2017b
Compatible with any release
Platform Compatibility
Windows macOS Linux
Find more on Data Type Conversion in Help Center and MATLAB Answers

Inspired by: movingstd & movingstd2

Inspired: Sound Pressure Level Calculator

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Version Published Release Notes

removed feval calls, updated help

fixed narginchk warning, treat V always as a vector even when it is a matrix

can now handle (anonymous) funtion handles properly