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A method implemented for objects of different classes.


Pfr_Ptot(x, ...)

# S3 method for default
Pfr_Ptot(x, ...)

# S3 method for numeric
Pfr_Ptot(x, spct.out = length(x) > 20, ...)

# S3 method for source_spct
Pfr_Ptot(x, ...)



an R object


not used


logical Flag indicating if the returned object should be of class response_spct instead of numeric.


If x is numeric, giving wavelengths (nm), a vector of numeric values giving the unitless photon ratio at each wavelength or a

generic_spct object with the wavelength values sorted in ascending order and the corresponding Pfr_Ptot values in column


If x is a source_spct object, a single numeric value giving the unitless photon ratio

Methods (by class)

  • Pfr_Ptot(default): Default for generic function

  • Pfr_Ptot(numeric): Specialization for numeric

  • Pfr_Ptot(source_spct): Specialization for source_spct

    Calculate phytochrome photoequilibrium from spectral (photon) irradiance


If you use these data in a publication, please cite also the original source as given under references.


Mancinelli, A.L. (1994) The physiology of phytochrome action. In Photomorphogenesis in plants, 2nd edition. R.E. Kendrick and G.H.M. Kronenberg, eds. Kluwer Academic Publishers, Dordrecht, pp. 211-269. ISBN 978-0-7923-2551-2 (print), 978-94-011-1884-2 (on-line). doi:10.1007/978-94-011-1884-2_10