combine.mimf: Adds IMFs

In PierreMasselot/emdr: Tools for EMD-regression

Description

Sums one or several IMFs and returns a mimf object. Useful for when several IMFs have similar frequencies.

Usage

combine.mimf(object, select, new.names = NULL)

Arguments

object	mimf object or array.
select	List of vector giving the IMFs to be summed. Each vector gives the IMFs to be summed into a single IMF. Elements of select should not overlap.
new.names	Character vector giving names ti the new IMFS. If NULL default names are generated.

Details

When noise variables are added to the signal to perform the NA-MEMD, it often results in a too large number of IMFs with very similar oscillation periods. combine.mimf allows gathering htese IMFs into a single one. The IMFs to comnine should be carefully selected by checking their mean period and examining the plot.

Value

Returns a mimf object.

Examples

   library(dlnm)
   
   # Decompose both temperature and relative humidity with NA-MEMD
   # Adding two noise variables 
   X <- chicagoNMMAPS[,c("temp", "rhum")]
   set.seed(123)
   mimfs <- memd(X, l = 2) # Takes a couple of minutes

   # Plot resulting IMFs
   plot(mimfs)

   # Sum MIMFs with similar frequencies
   cmimfs <- combine.mimf(mimfs, list(10:11, 12:13), 
     new.names = c("C10", "C11"))
   plot(cmimfs)

PierreMasselot/emdr documentation built on June 19, 2021, 2:11 p.m.