Preprocesses spectra as for the prediction of a peat property

This function lets you extract the spectra after automated preprocessing for the prediction of a specific peat property. This allows to inspect the preprocessed spectra.

Usage

irp_preprocess_for(x, y = NULL, variable)

Arguments

x

An object of class ir. See the individual prediction models for further data requirements.

y

An object of class ir or NULL. Needed for prediction functions using more than one set of spectra (irp_microbial_nitrogen_content_1). See the individual prediction models for further data requirements. For other functions, y is not used and should be set to NULL (the default).

variable

A character vector with one or more values that define for which components contents are computed for the spectra in x. Currently allowed values are:

"all": irp_content computes all of the values below.
"klason_lignin_content_1": Klason lignin mass fraction [g/g] as computed by irp_content_klh_hodgkins().
"holocellulose_content_1": Holocellulose mass fraction [g/g] as computed by irp_content_klh_hodgkins().
"klason_lignin_content_2": Klason lignin mass fraction [g/g] as computed by irp_klason_lignin_content_2().
"holocellulose_content_2": Holocellulose mass fraction [g/g] as computed by irp_holocellulose_content_2().
"eac_1": Electron accepting capacity as computed by irp_eac_1().
"edc_1": Electron donating capacity as computed by irp_edc_1().
"carbon_content_1": Carbon content as computed by irp_carbon_content_1().
"nitrogen_content_1": Nitrogen content as computed by irp_nitrogen_content_1().
"hydrogen_content_1": Hydrogen content as computed by irp_hydrogen_content_1().
"oxygen_content_1": Oxygen content as computed by irp_oxygen_content_1().
"phosphorus_content_1": Phosphorus content as computed by irp_phosphorus_content_1().
"potassium_content_1": Potassium content as computed by irp_potassium_content_1().
"sulfur_content_1": Sulfur content as computed by irp_sulfur_content_1().
"titanium_content_1": Titanium content as computed by irp_titanium_content_1().
"silicon_content_1": Silicon content as computed by irp_silicon_content_1().
"calcium_content_1": Calcium content as computed by irp_calcium_content_1().
"d13C_1": \(\delta^{13}\)C values as computed by irp_d13C_1().
"d15N_1": \(\delta^{15}\)N values as computed by irp_d15N_1().
"nosc_1": The nominal oxidation state of carbon as computed by irp_nosc_1().
"dgf0_1": The standard Gibbs free energy of formation content as computed by irp_dgf0_1().
"bulk_density_1": Bulk density as computed by irp_bulk_density_1().
"loss_on_ignition_1": Loss on ignition as computed by irp_loss_on_ignition_1().
"O_to_C_1": O/C ratio as computed by irp_O_to_C_1().
"H_to_C_1": H/C ratio as computed by irp_H_to_C_1().
"C_to_N_1": C/N ratio as computed by irp_C_to_N_1().
"volume_fraction_solids_1": Volume fraction of solids as computed by irp_volume_fraction_solids_1().
"non_macroporosity_1": Non-macroporosity as computed by irp_non_macroporosity_1().
"macroporosity_1": Macroporosity as computed by irp_macroporosity_1().
"saturated_hydraulic_conductivity_1": Saturated hydraulic conductivity as computed by irp_saturated_hydraulic_conductivity_1().
"specific_heat_capacity_1": Specific heat capacity as computed by irp_specific_heat_capacity_1().
"dry_thermal_conductivity_1": Dry thermal conductivity as computed by irp_dry_thermal_conductivity_1().
"microbial_nitrogen_content_1": Microbial nitrogen content as computed by irp_microbial_nitrogen_content_1().
"degree_of_decomposition_1": Degree of decomposition as computed by irp_degree_of_decomposition_1().
"degree_of_decomposition_2": Degree of decomposition as computed by irp_degree_of_decomposition_2().
"degree_of_decomposition_3": Degree of decomposition as computed by irp_degree_of_decomposition_3().

Value

x where the spectra now a are the preprocessed spectra which would be used in the next step to predict the peat property indicated by variable.

Examples

library(ir)

irp_preprocess_for(
   x = irpeat_sample_data,
   variable = "carbon_content_1"
) |>
  plot()
#> Warning: 650 selected instead of 645.
#> Warning: 650 selected instead of 645.
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