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gunit

In plant physiology, conductance to heat, carbon dioxide, and water vapour are expressed in different units for different purposes. For heat exchange, units of m/s are most often used, whereas for gas exchange units of either mol/m^2/s (the default output from LICOR devices) or umol/m^2/s/Pa are used. I found it difficult to keep all the conversions straight, so I made a small package to help ensure proper conversion.

Installation

You can install the current version of gunit from GitHub with:

remotes::install_github("cdmuir/gunit")

Or the released version of gunit from CRAN with:

install.packages("gunit")

Example

This is a basic example which shows you how to solve convert conductance units:

library(gunit)
library(units)

g_sw = set_units(0.4, mol/m^2/s)
convert_conductance(g_sw)
#> # A tibble: 1 × 3
#>     `m/s` `umol/m^2/s/Pa` `mol/m^2/s`
#>     [m/s] [umol/m^2/Pa/s] [mol/m^2/s]
#> 1 0.00979            3.95         0.4

# Change Temperature and Pressure
g_sw = set_units(0.4, mol/m^2/s)
convert_conductance(g_sw, 
                    P = set_units(80, kPa), 
                    Temp = set_units(293, K))
#> # A tibble: 1 × 3
#>    `m/s` `umol/m^2/s/Pa` `mol/m^2/s`
#>    [m/s] [umol/m^2/Pa/s] [mol/m^2/s]
#> 1 0.0122               5         0.4

# Calculations can also be vectorized

g_sw = set_units(seq(0.1, 0.4, 0.1), mol/m^2/s)
convert_conductance(g_sw)
#> # A tibble: 4 × 3
#>     `m/s` `umol/m^2/s/Pa` `mol/m^2/s`
#>     [m/s] [umol/m^2/Pa/s] [mol/m^2/s]
#> 1 0.00245           0.987         0.1
#> 2 0.00489           1.97          0.2
#> 3 0.00734           2.96          0.3
#> 4 0.00979           3.95          0.4

Contributors

• Chris Muir

Comments and contributions

I welcome comments, criticisms, and especially contributions! GitHub issues are the preferred way to report bugs, ask questions, or request new features. You can submit issues here:

https://github.com/cdmuir/gunit/issues

Meta

• Please report any issues or bugs.
• License: MIT
• Get citation information for gunit in R doing citation(package = 'gunit')
• Please note that the ‘gunit’ project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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