smooth {spectralAnalysis}

generic smoothing function

Description

smoothing is applied along the spectral axis, not the time axis

Usage

smooth(object, ...)

## S4 method for signature 'SpectraInTime'
smooth(
  object,
  method = "sg",
  order = 3,
  window = order + 7 - order%%2,
  derivative = 0,
  dim = "spectralAxis"
)

## S4 method for signature 'SpectraInTimeComp'
smooth(object, ...)

Arguments

object

a S4 class object

...

additional parameters

method

character vector smoothing method, options are 'sg' (= default, Savitsky-Golay filter) or 'mean'.

order

numeric value, order of the polynomial used to interpolate (only used when method = 'sg'), should be larger than derivative order, defaults to 3 + derivative

window

width of the smoothing default value slightly higher than in the signal package, the user might consider a large value, otherwise smoothing has little effect

derivative

derivative to be taken (only used when method = 'sg'), defaults to 0

dim

character string, specifying along which dimension smoothing should be applied. Options are "spectralAxis" (= default) or "time"

Value

SpectraInTime-class

Note

equal distances between wavelenght intervals are assumed

Examples

    spectralEx     <-  getSpectraInTimeExample()
    smoothDefault   <-  smooth( spectralEx )
    timeRange       <-  range( getTimePoints( spectralEx ))
    timesToSelect   <-  e( seq( timeRange[1] , timeRange[2] , length.out = 5  )  )
    smoothALot      <-  smooth( spectralEx ,  order = 2 , window = 301  ) 
    derivative1     <-  smooth( spectralEx , derivative = 1 )   
    derivative2     <-  smooth( spectralEx , derivative = 2 )