>Psychtoolbox>PsychColorimetricData>StockmanRiderNomogram

T_absorbance = StockmanRiderNomogram(S, lambdaMax)

Compute normalized absorbance using the Stockman-Rider Fourier polynomial
nomogram, as described in:
Stockman, A. & Rider, A. T. (2023). Formulae for generating standard and
individual human cone spectral sensitivities. Color Research and Application,
48, 818-840.

The appropriate L, M, or S cone Fourier template is selected for each
lambdaMax value based on which cone type’s range it falls in, using split
points halfway between the nominal template peaks:
S template peak: 416.9 nm
M template peak: 529.8 nm
L template peak: 551.9 nm
S/M split: 473.35 nm (midpoint of 416.9 and 529.8)
M/L split: 540.85 nm (midpoint of 529.8 and 551.9)

If lambdaMax is a 3-element column vector it is assumed to be [L; M; S]
in that order. An error is thrown if the values do not fall in the
expected ranges, since that likely indicates a calling error.

The result is in quantal units (absorbance in the sense used by PTB
nomograms). The output is normalized to a peak of 1 for each row,
if wavelength spacing is <= 1 nm.

To get sensitivity in energy units, apply EnergyToQuanta().

Various utility routines from Stockman-Rider are include, with sr
prepended to all of their names to avoid namespace collision with
PTB routines that do similar things.

Good lambda max values (L, M, S): 551.9, 529.8, 416.9 nm.
These are the nominal template peaks built into the Stockman-Rider
nomogram itself and reproduce the standard CIE photopigment absorbances
well.

See also: PhotopigmentNomogram, srLconelog, srMconelog, srSconelog,
srLMSconelog, srDemo