Merge list-columns of spectra, x-axis values, metadata and additional measured variables into a single long form data.table

Helper function that merges all spectra and related data into a single long form data.table than can subsequently be used for plotting.

merge_dts(
  spc_tbl,
  lcols_spc = c("spc", "spc_pre"),
  lcol_measure = NULL,
  spc_id = "unique_id",
  group_id = "sample_id"
)

Arguments

spc_tbl: Tibble data frame containing spectra, x-axis values, metadata and eventual measured variables as list-columns.
lcols_spc: Character vector of spectral list-columns to be extracted. Default is c("spc", "spc_pre") (raw and preprocessed spectra).
lcol_measure: Character vector of length 1 denoting the column name of the measure columns. This argument is optional. Default is NULL, which does not extract an additional measure column.
spc_id: Character vector of column that contains a unique spectral identifier for all spectra. Default is "unique_id".
group_id: Character vector of columns that is used assigning spectra into groups. Default is "sample_id". The group_id can be used for later plotting and thereby visually separating spectral groups into using different colors or panels.

A single data.table containing long form aggregated data of spectra, x-axis values, metadata and an additionally measured variable.