iwNormRcosine {msPurity} | R Documentation

## Raised cosine normalisation for isolation window efficiency

### Description

Creates a function based on a rasied cosine curve shape that will normalise any intensity values within a defined isolation window

The function that is created will output a value between 0 to 1 based on the position between the minOff and maxOff params

### Usage

    iwNormRcosine(minOff = -0.5, maxOff = +0.5)

### Arguments

`minOff` | numerical; Offset to the 'left' for the precursor range. (Should be negative)
`maxOff` | character; Offset to the 'left' for the precursor range. (Should be positive)

### Value

normalisation function for selected range

### Examples

    iwNormFun <- iwNormRcosine()
    pm <- data.frame(mz=c(99.5, 99.9, 100, 100.1, 100.5),i=c(1000, 1000, 1000, 1000, 1000))
    mzmax = 100.5
    mzmin = 99.5
    middle <- mzmax-(mzmax-mzmin)/2
    adjustmz = pm$mz-middle

    # normalise the intensities
    pm$normi = pm$i*iwNormFun(adjustmz)

[Package msPurity version 1.18.0 Index]