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flux_const = function(){
#' @export
#'
#' @title constant deterministic tracer flux
#'
#' @description
#' For usage with _strat_cont_to_multiadm_; defines constant tracer flux in the time domain
#' @returns a function factory that takes no arguments
#'
#' @examples
#' \dontrun{
#' # see this vignette for an example
#' vignette("adm_from_trace_cont")
#' }
#'
#' @seealso [flux_linear()], [flux_quad()], [strat_cont_gen_from_tracer()]
f = function() {stats::approxfun(x = c(0,1),
y = c(1,1),
rule = 2)}
return(f)
}
flux_linear = function(x0 = 0, y0 = 1, x1 = 1, y1 = 2){
#' @export
#'
#' @title linear deterministic tracer flux
#'
#' @description
#' For usage with _strat_cont_to_multiadm_ : defines linear tracer flux in the time domain
#' Tracer flux is the linear function passing through the points (x0, y0) and (x1, y1)
#' @param x0 numeric, abscissa
#' @param y0 numeric, ordinate
#' @param x1 numeric, abscissa
#' @param y1 numeric, ordinate
#'
#' @returns a function factory that takes no arguments. Upon each evaluation, it returns a linear function passing through the points (x0, y0) and (x1, y1)
#'
#' @seealso [flux_const()], [flux_quad()], [strat_cont_gen_from_tracer()]
f = function(x){
m = (y1 - y0)/(x1 - x0)
return( m * (x - x0) + y0 )
}
return( function() return(f))
}
flux_quad = function(a = 1, b = 1, c = 1){
#' @export
#'
#' @title quadratic deterministic tracer flux
#'
#' @description
#' For usage with _strat_cont_to_multiadm_ : defines quadratic tracer flux in the time domain
#' defined by the function f(x) = ax^2 + bx + c
#' @param a numeric
#' @param b numeric
#' @param c numeric
#'
#' @seealso [flux_linear()], [flux_const()], [strat_cont_gen_from_tracer()]
#'
#' @returns a function factory that takes no arguments. Upon each evaluation, it returns the quadratic function f(x) = ax^2 + bx + c
f = function(x){
return(a*x^2 + b*x +c)
}
return(function() return(f))
}
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