Read a .csv file with categorical data

Description

Reads a data table containing categorical data (e.g. petrographic, heavy mineral or geochemical data)

Usage

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read.compositional(fname, method = NULL, colmap = "rainbow")

Arguments

fname

a string with the path to the .csv file

method

either "bray" (for the Bray-Curtis distance) or "aitchison" (for Aitchison's central logratio distance). If omitted, the function defaults to 'aitchison', unless there are zeros present in the data.

colmap

an optional string with the name of one of R's built-in colour palettes (e.g., heat.colors, terrain.colors, topo.colors, cm.colors), which are to be used for plotting the data.

Value

an object of class compositional, i.e. a list with the following items:

x: a data frame with the samples as rows and the categories as columns

method: either "aitchison" (for Aitchison's centred logratio distance) or "bray" (for the Bray-Curtis distance)

Examples

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fname <- system.file("Major.csv",package="provenance")
Major <- read.compositional(fname)
plot(PCA(Major))

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