# 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

• Get citation information for `gunit` in R doing `citation(package = 'gunit')`