Sliding window centered at a given point

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Laura petrescu
Laura petrescu 2019-8-24
评论： Image Analyst 2019-8-24
Hi! I have a signal and I need to create a sliding window of known length (let's say x) but it needs to be centered at a given point (y). Can anyone help me? Thanks!

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回答（1 个）

Image Analyst
Image Analyst 2019-8-24
编辑：Image Analyst 2019-8-24
What are you doing with signal values inside the sliding window? Taking the mean, std, or something custom? If it's some operation/function of your own invention, you can use nlfilter(). Otherwise maybe the family of mov***() might work, for example movmean(), etc. Or there's a variety of built-in functions, like sgolayfilt(), (which fits data in the window to a polynomial), etc.
  2 个评论
Laura petrescu
Laura petrescu 2019-8-24
I have to extract some time and frequency features, including std, mean, etc
Image Analyst
Image Analyst 2019-8-24
Try movmean(), movstd(), movvar(), movmedian(), stdfilt(), and nlfilt().
For frequency info, try fft(), spectrogram(), periodogram(), and pwelch().

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