Nothing
#
# vim:set ff=unix expandtab ts=2 sw=2:
OnepModel14<-structure(
function #Implementation of a one-pool C14 model
### This function creates a model for one pool. It is a wrapper for the more general function \code{\link{GeneralModel_14}}.
( t, ##<< A vector containing the points in time where the solution is sought. It must be specified within the same period for which the Delta 14 C of the atmosphere is provided. The default period in the provided dataset \code{\link{C14Atm_NH}} is 1900-2010.
k, ##<< A scalar with the decomposition rate of the pool.
C0, ##<< A scalar containing the initial amount of carbon in the pool.
F0_Delta14C, ##<< A scalar containing the initial amount of the radiocarbon fraction in the pool in Delta_14C format.
In, ##<< A scalar or a data.frame object specifying the amount of litter inputs by time.
xi=1, ##<< A scalar or a data.frame specifying the external (environmental and/or edaphic) effects on decomposition rates.
inputFc, ##<< A Data Frame object consisting of a function describing the fraction of C_14 in per mille. The first column will be assumed to contain the times.
lambda=-0.0001209681, ##<< Radioactive decay constant. By default lambda=-0.0001209681 y^-1 . This has the side effect that all your time related data are treated as if the time unit was year.
lag=0, ##<< A (positive) scalar representing a time lag for radiocarbon to enter the system.
solver=deSolve.lsoda.wrapper, ##<< A function that solves the system of ODEs. This can be \code{\link{euler}} or \code{\link{ode}} or any other user provided function with the same interface.
pass=FALSE ##<< if TRUE Forces the constructor to create the model even if it is invalid
)
{
t_start=min(t)
t_stop=max(t)
if(length(k)!=1) stop("k must be a scalar (length == 1)")
if(length(C0)!=1) stop("initial conditions must be of length = 1")
if(length(F0_Delta14C)!=1) stop("initial 14C fraction must be of length = 1")
C0=c(C0)
F0_Delta14C=c(F0_Delta14C)
if(length(In)==1) inputFluxes=BoundInFlux(
function(t){matrix(nrow=1,ncol=1,In)},
t_start,
t_stop
)
if(class(In)=="data.frame"){
x=In[,1]
y=In[,2]
inputFlux=function(t0){as.numeric(spline(x,y,xout=t0)[2])}
inputFluxes=BoundInFlux(
function(t){matrix(nrow=1,ncol=1,inputFlux(t),0)},
t_start,
t_stop
)
}
if(length(xi)==1) fX=function(t){xi}
if(class(xi)=="data.frame"){
X=xi[,1]
Y=xi[,2]
fX=function(t){as.numeric(spline(X,Y,xout=t)[2])}
}
A=-abs(matrix(k,1,1))
At=BoundLinDecompOp(
function(t){
fX(t)*A
},
t_start,
t_stop
)
inputFc=BoundFc(inputFc,lag=lag,format="Delta14C")
mod=GeneralModel_14(
t,
At,
ivList=C0,
initialValF=ConstFc(F0_Delta14C,"Delta14C"),
inputFluxes=inputFluxes,
inputFc,
di=lambda,
pass=pass
)
### A Model Object that can be further queried
##seealso<< \code{\link{OnepModel}}, \code{\link{TwopParallelModel14}},
##\code{\link{TwopFeedbackModel14}}
}
,
ex=function(){
years=seq(1901,2009,by=0.5)
LitterInput=700
Ex=OnepModel14(t=years,k=1/10,C0=500, F0=0,In=LitterInput, inputFc=C14Atm_NH)
C14t=getF14(Ex)
plot(C14Atm_NH,type="l",xlab="Year",ylab="Delta 14C (per mil)",xlim=c(1940,2010))
lines(years, C14t[,1], col=4)
legend(
"topright",
c("Delta 14C Atmosphere", "Delta 14C in SOM"),
lty=c(1,1),
col=c(1,4),
lwd=c(1,1),
bty="n"
)
}
)
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.