RsqEC4photo(obsDat, iVcmax = 60, iVpmax = 120, iVpr = 80, iJmax = 400, co2 = 380, o2 = 210, type = c("Assim", "StomCond"))
\mu mol
m^{-2} s^{-1}). The second column should be
the observed quantum flux (\mu mol m^{-2}
s^{-1}). The third column should be observed
temperature of the leaf (Celsius). The fourth column
should be the observed relative humidity in proportion
(e.g. 0.7).\mu mol
m^{-2} s^{-1}).\mu
mol m^{-2} s^{-1}).\mu mol
m^{-2} s^{-1}).\mumol electrons m^{-2} s^{-1}).\mubar) (default = 380)."Assim" if you want an R^2
for assimilation data and use "StomCond" if you
want an R^2 for stomatal conductance data.numeric object
It simply returns the R^2 value for the given data
and coefficients.
This is an auxiliary function which is made available in case it is useful. It calculates the R-squared based on observed assimilation (or stomatal conductance) data and coefficients for the von Caemmerer C4 photosynthesis model. The only coefficients being considered are Vcmax, Vpmax, Vpr and Jmax.
data(obsNaid) obs <- obsNaid ## These data are from Naidu et al. (2003) ## in the correct format res <- RsqEC4photo(obs) ## Other example using Beale, Bint and Long (1996) data(obsBea) obsD <- obsBea resB <- RsqEC4photo(obsD)