R Graphical Manual

Last data update: 2014.03.03

R: Log transformation

LogTransform

R Documentation

Log transformation

Log transform a metabolomics data matrix.

LogTransform(inputdata, base = exp(1),
    saveoutput = FALSE, outputname = "log.results")

`inputdata`	A data frame in the input data format. See `metabolomics` for details.
`base`	The base with respect to which logarithms are computed. The default computes the natural logarithm.
`saveoutput`	A logical indicating whether the output should be saved as a .csv file.
`outputname`	The name of the output file if the output has to be saved.

The result is an object of class metabdata. This is a list containing the following elements:

`output`	A normalised data matrix in the input data format.
`samples`	A character string containing the names of the samples.
`groups`	A character string containing the names of the groups.

Alysha M De Livera, Jairus B Bowne

    data(treated)
    log.data <- LogTransform(treated)$output
    log.data