Piece-wise Aggregate Approximation

Piece-wise Aggregate Approximation in R

paa <- function(data, window) {
 ret = NULL
 start = 1
 while (start <= nrow(data)) {
  end = min(start + window - 1, nrow(data))
  ret = rbind(ret, colMeans(data[start:end,]))
  start = start + window
 }
 return(ret) 
}

Removing ^M characters (windows line endings) using VIM editor

Removing \r\n (windows line endings) in VIM editor

In vi, you can remove the carriage return ( ^M ) characters with the following command:

:1,$s/^M//g

Note: To input the ^M character, press Ctrl-v , then press Enter or return.