scale_x_wavenumber_continuous: Wavenumber x-scale

In ggspectra: Extensions to 'ggplot2' for Radiation Spectra

Wavenumber x-scale

Description

Scale x continuous with defaults suitable for wavelengths expressed as wavenumbers [m^{-2}].

Usage

scale_x_wavenumber_continuous(
  unit.exponent = -6,
  name = w_number_label(unit.exponent = unit.exponent, label.text = label.text,
    axis.symbols = axis.symbols),
  breaks = scales::pretty_breaks(n = 7),
  labels = SI_pl_format(exponent = -unit.exponent),
  label.text = axis_labels()[["w.number"]],
  axis.symbols = getOption("ggspectra.axis.symbols", default = TRUE),
  ...
)

Arguments

unit.exponent	integer
name	The name of the scale, used for the axis-label.
breaks	The positions of ticks or a function to generate them.
labels	The tick labels or a function to generate them from the tick positions.
label.text	character Textual portion of the labels.
axis.symbols	logical If TRUE symbols of the quantities are added to the name. Supported only by format = "R.expression".
...	other named arguments passed to scale_y_continuous

Details

This scale automates the generation of axis labels when the variable mapped to the x aesthetic contains numeric values for wavelengths expressed wavenumbers. This is not how spectral data are stored in all the packages of the R for Photobiology suite and can be used in plots built with ggplot2() with explicit mapping using a conversion function. If desired, a secondary axis can be added manually as described in sec_axis.

Note

This function only alters two default arguments, please, see documentation for scale_continuous

Examples

ggplot(sun.spct, aes(x = wl2wavenumber(w.length), y = s.e.irrad)) +
  geom_line() +
  scale_x_wavenumber_continuous()

ggplot(sun.spct, aes(x = wl2wavenumber(w.length), y = s.e.irrad)) +
  geom_line() +
  scale_x_wavenumber_continuous(unit.exponent = -5)

ggspectra documentation built on April 4, 2025, 2:19 a.m.