Skip to contents

Normalize Spectra

Source: R/preprocess.R
ls_normalize.Rd

Normalizes intensity values. Methods:

  • "total" — divide each shot by total intensity

  • "max" — divide by per-shot maximum

  • "snv" — Standard Normal Variate: (x - mean) / sd

  • "internal_std" — divide by intensity at a reference line

  • "area" — divide by integrated (trapezoidal) area

Usage

ls_normalize(x, method = "total", ref_wavelength = NULL, ref_window = 1)

Arguments

x

A ls_spectrum() or ls_dataset() object.

method

Character. Normalization method. Default "total".

ref_wavelength

Numeric. Required for method = "internal_std".

ref_window

Numeric. Window width (nm) around ref_wavelength. Default 1.

Value

Same class as input with normalized intensities.

Examples

spec <- ls_simulate_spectrum(seed = 1)
spec_n <- ls_normalize(spec, method = "total")
sum(spec_n$intensity[1, ])  # ~1
#> [1] 1