wavelengthsfrom

Wavelengthsfrom is a term used in spectroscopy and software libraries to denote a function, method, or utility that derives a set of wavelengths from given spectral data. It is commonly implemented in data processing pipelines that handle frequency, wavenumber, or pixel-based spectral information, and may appear under different naming conventions in various programming environments.

In practice, wavelengthsfrom takes input data that encode spectral information and outputs a corresponding wavelength scale. If the input is frequency data f, the associated wavelengths are computed using lambda = c / f, where c is the speed of light and the result is expressed in consistent units (for example nanometers or meters). When the input is wavenumber nu_bar (usually in cm^-1), the wavelength is lambda = 1 / nu_bar, with appropriate unit conversions. In detector-based workflows, wavelengthsfrom may rely on a predefined calibration, mapping pixel indices to wavelengths via a linear or polynomial relationship established during instrument calibration.

Typical inputs include arrays of frequencies, wavenumbers, or calibrated pixel indices, along with optional calibration constants. Outputs are arrays of wavelengths aligned with the input coordinates and accompanied by metadata such as units and uncertainty estimates. The function is used to prepare spectral data for visualization, feature extraction, line identification, and cross-instrument comparisons.

Because wavelengthsfrom is not a single standardized standard, its exact interface and behavior vary by library or project. Related concepts include wavelength calibration, frequency-to-wavelength conversion, and spectral data processing. See also: speed of light, frequency, wavenumber, spectroscopy.