rt2ri {TargetSearch} | R Documentation

## Retention Time to Retention Time Index convertion

### Description

Convert retention times to retention indices based on observed FAME RI and their standard values.

### Usage

    rt2ri(rtTime, observed, standard)

### Arguments

`rtTime` | The extracted RT's to convert
`observed` | The observed FAME RT's
`standard` | The standard RI for each FAME

### Details

Linear interpolation, interpolation outside bounds are done with continued linear interpolation from the last two FAME's

### Value

The converted RI

### Author(s)

Alvaro Cuadros-Inostroza, Matthew Hannah, Henning Redestig

### See Also

`RIcorrect`, `FAMEoutliers`

### Examples

      # RI standards
      standard <- c(100, 200, 300, 400, 500)
      # observed standard retention times
      observed <- c(10.4, 19.3, 32.4, 40.2, 50.3)
      # a random set of retention times
      RT       <- runif(100,1,60)
      # the corrected RIs
      RI       <- rt2ri(RT, observed, standard)

[Package TargetSearch version 1.50.1 Index]