modify_equations {gasanalyzer}

Modify an existing list of equations with specific user-specified equations.

Description

This method allows replacing a specific equations in a list with custom versions. Although it is possible to add custom equations using create_equations(), it can be useful to modify existing sets. It can also be used to modify equations imported from an xlsx file.

Usage

modify_equations(eqs, ...)

Arguments

eqs

a list of calls for recomputing gasanalyzer equations.

...

custom equations. the arguments must tagged function expressions. The tags will be matched against the equation list specified in eqs, and matching expressions will be replaced. Additional expressions will be added to the list. Note that the function body must be wrapped in curly brackets.

Value

A modified list of calls containing equations to recalculate gasanalyzer data.

See Also

read_6800_equations()

Examples

exampledir <- system.file("extdata", package = "gasanalyzer")

# import factory calibration for example data:
import_factory_cals(exampledir)

# read data from a txt file:
li6800 <- read_6800_txt(paste0(exampledir, "//lowo2"))

# create a default set of gas-exchange equations, for the Li-6800:
Eqs <- create_equations(c("default", "li6800"))

# replace the value for the leaf light absorptance:
Eqs <- modify_equations(Eqs, LeafQ.alpha = \() {0.86})

# apply:
li6800_recalc <- recalculate(li6800, Eqs)

li6800$LeafQ.alpha
li6800_recalc$LeafQ.alpha