| evalPars {hydromad} | R Documentation |
evalPars evaluates a model for a named matrix of parameters. To help sample parameters, getFreeParsRanges returns the list of ranges of parameters that do not have fixed parameter values.
evalPars(par.matrix, object, objective = hydromad.getOption("objective"))
getFreeParsRanges(object)
par.matrix |
Named matrix or data.frame of parameter values, with each row corresponding to a model realisation to evaluate |
object |
an object of class |
objective |
the objective function or expression, which can refer to Q and X. See |
The functions are used with the sensitivity package to perform sensitivity analysis. See demo(sensitivity). Note that the objective function may more generally return any scalar result, e.g. a scalar prediction calculated only using X.
evalPars returns a vector of objective function values, corresponding to the evaluation of each row of par.matrix.
getFreeParsRanges returns a named list of parameter ranges, for each parameter that does not have fixed parameter values.
Joseph Guillaume
objFunVal.hydromad, parameterSets
data(Cotter) obs<-Cotter[1:1000] modx <- hydromad(obs, sma = "cwi", routing = "expuh", tau_s = c(2,100), v_s = c(0,1)) ## Sample 10 random parameters pars<- parameterSets(getFreeParsRanges(modx),10,method="random") ## Return the default objective function value for each model realisation evalPars(pars,object=modx) ## Calculate the 20%ile flow for each model realisation evalPars(pars,object=modx,objective=~quantile(X,0.2))