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Interpolate Spectral Data to Match Reference Wavenumbers (Left Join Style)

Source: R/spec_interpolation.R
spec_interpolate_left.Rd

This function interpolates spectral data to match the wavenumber grid of a reference dataset. Works like a left join - keeps all wavenumbers from the reference data and interpolates the spectral data to match those wavenumbers.

Usage

spec_interpolate_left(
  .data,
  reference,
  wn_col = NULL,
  method = "pchip",
  extrapolate = FALSE,
  ...
)

Arguments

.data

A `data.frame` or `tibble` containing spectral data to be interpolated.

reference

A `data.frame` or `tibble` containing the reference wavenumber grid.

wn_col

A character string specifying the column name for the wavenumber data. If NULL, uses the default set with set_spec_wn().

method

A character string specifying the interpolation method. Options: "linear", "pchip", "spline", "akima". Default is "pchip".

extrapolate

Logical. Should values be extrapolated outside the original range? Default is FALSE (returns NA for out-of-range values).

...

Additional arguments passed to the interpolation method.

Value

A `tibble` with interpolated spectral data using the reference wavenumber grid.