R: Calculate smoothed derivates

sgolayDeriv {mQTL} | R Documentation

## Calculate smoothed derivates

### Description

Calculate smoothed derivates using Savitzky-Golay filter

### Usage

    sgolayDeriv(dpSpectr, iOrder, iFrameLen, j)

### Arguments

`dpSpectr` | input spectrum
`iOrder` | polynomial order of Savitzky - Golay filter
`iFrameLen` | Savitzky-Golay frame length in ppm scale
`j` | order of derivative

### Value

jth dervitative of the spectrum

### Author(s)

Lyamine Hedjazi

### See Also

`sgolay`

### Examples

    ## Data

    Sp=matrix(rnorm(10*13454,mean=0,sd=1), nrow=10,ncol=13454)

    ## Peak picking
    Spectrum<-Sp[10,]
    iOrder <- 3
    iFrameLen<- 11
    j<-2

    SpDerivs=sgolayDeriv(Spectrum,iOrder,iFrameLen,j)

[Package mQTL version 1.0 Index]