simple examples of filter function, recursive option specifically

Question

I am seeking some simple (i.e. - no maths notation, long-form reproducible code) examples for the filter function in R I think I have my head around the convolu

Answer 1

I spent one hour in reading this, below is my summary, by comparison with Matlab

NOTATION: command in Matlab = command in R

filter([1,1,1], 1, data) = filter(data, [1,1,1], method = "convolution") ; but the difference is that the first 2 elements are NA 


filter(1, [1,-1,-1,-1], data) = filter(data, [1,1,1], method = "recursive")

If you know some from DSP, then recursive is for IIR, convolution is for FIR