insert_hinges {photobiology}

Insert wavelength values into spectral data.

Description

Inserting wavelengths values immediately before and after a discontinuity in the SWF, greatly reduces the errors caused by interpolating the weighted irradiance during integration of the effective spectral irradiance. This is specially true when data have a large wavelength step size.

Usage

insert_hinges(x, y, h)

Arguments

x

numeric vector (sorted in increasing order)

y

numeric vector

h

a numeric vector giving the wavelengths at which the y values should be inserted by interpolation, no interpolation is indicated by an empty vector (numeric(0))

Value

a data.frame with variables x and y. Unless the hinge values were already present in y, each inserted hinge, expands the vectors returned in the data frame by one value.

Note

Insertion is a costly operation but I have tried to optimize this function as much as possible by avoiding loops. Earlier this function was implemented in C++, but a bug was discovered and I have now rewritten it using R.

See Also

Other low-level functions operating on numeric vectors.: as_energy(), as_quantum_mol(), calc_multipliers(), div_spectra(), energy_irradiance(), energy_ratio(), integrate_xy(), interpolate_spectrum(), irradiance(), l_insert_hinges(), oper_spectra(), photon_irradiance(), photon_ratio(), photons_energy_ratio(), prod_spectra(), s_e_irrad2rgb(), split_energy_irradiance(), split_photon_irradiance(), subt_spectra(), sum_spectra(), trim_tails(), v_insert_hinges(), v_replace_hinges()

Examples

with(sun.data,
    insert_hinges(w.length, s.e.irrad,
       c(399.99, 400.00, 699.99, 700.00)))