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IsoplotR

IsoplotR is a free and open-source substitute for Kenneth Ludwig's popular Isoplot add-in to Microsoft Excel. This Github repository contains the code for IsoplotR's core commands. A graphical user interface is provided in a separate repository at https://github.com/pvermees/IsoplotRgui.

Installation

You must have R installed on your system (see https://www.r-project.org/). The most recent stable version of IsoplotR is available from CRAN at https://cran.r-project.org/package=IsoplotR and can be installed on your system as follows:

install.packages('IsoplotR')

Alternatively, the current development version of IsoplotR can be installed from Github with the remotes package:

install.packages('remotes')
remotes::install_github('pvermees/IsoplotR')

Example

Once installed, IsoplotR can be loaded into memory by entering the following code at the R command prompt:

library(IsoplotR)

Now we can issue IsoplotR commands to R. For example:

setwd(system.file(package='IsoplotR')) # navigate to the built-in data files
RbSr <- read.data('RbSr1.csv',method='Rb-Sr',format=1)  
isochron(RbSr)

Further information

See http://isoplotr.london-geochron.com

Vermeesch, P., 2018, IsoplotR: a free and open toolbox for geochronology. Geoscience Frontiers, v.9, p.1479-1493, doi: 10.1016/j.gsf.2018.04.001.

Author

Pieter Vermeesch

License

This project is licensed under the GPL-3 License

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Version

Install

install.packages('IsoplotR')

Monthly Downloads

1,043

Version

4.0

License

GPL-3

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Maintainer

Pieter Vermeesch

Last Published

June 6th, 2021

Functions in IsoplotR (4.0)

IsoplotR-internal

Internal code objects
cad

Plot continuous data as cumulative age distributions
Pb0corr

Common Pb correction
age2ratio

Predict isotopic ratios from ages
IsoplotR

library(IsoplotR)
classes

Geochronological data classes
age

Calculate isotopic ages
agespectrum

Plot a (40Ar/39Ar) release spectrum
central

Calculate U-Th-He and fission track central ages and compositions
concordia

Concordia diagram
diseq

Set up U-series disequilibrium correction for U-Pb geochronology
ellipse

Get error ellipse coordinates for plotting
isochron

Calculate and plot isochrons
helioplot

Visualise U-Th-He data on a logratio plot or ternary diagram
evolution

Th-U evolution diagram
examples

Example datasets for testing IsoplotR
discfilter

Set up a discordance filter
data2york

Prepare geochronological data for York regression
ludwig

Linear regression of U-Pb data with correlated errors, taking into account decay constant uncertainties.
peakfit

Finite mixture modelling of geochronological datasets
radialplot

Visualise heteroscedastic data on a radial plot
kde

Create (a) kernel density estimate(s)
titterington

Linear regression of X,Y,Z-variables with correlated errors
weightedmean

Calculate the weighted mean age
york

Linear regression of X,Y-variables with correlated errors
scatterplot

Create a scatter plot with error ellipses or crosses
read.data

Read geochronology data
set.zeta

Calculate the zeta calibration coefficient for fission track dating
settings

Load settings to and from json
mds

Multidimensional Scaling
mclean

Predict disequilibrium concordia compositions