add_item: Define or append model inputs

In WARDEN: Workflows for Health Technology Assessments in R using Discrete EveNts

Define or append model inputs

Description

Build a single {} expression that defines inputs for a simulation.

• Named args in ... become assignments (name <- expr), e.g., add_item(a=5)

• Unnamed args are inserted raw/unevaluated. If an unnamed arg is a {} block, its statements are spliced (flattened). add_item(pick_val_v(...))

• Works with magrittr pipes: a leading . (the LHS) is resolved to its value; if that value is a {} block (or list of expressions), it becomes the starting block.

• input argument can be used to handle alternative add_item2 method, e.g. add_item(input = {a <- 5})

Usage

add_item(..., .data = NULL, input)

Arguments

...	Unevaluated arguments. Named → name <- expr; unnamed → raw expr.
.data	Optional named argument: an existing {} block (or list of expressions) to start from.
input	Optional unevaluated expression or {} block to splice in.

Value

A single {} call (language object) ready for load_inputs().

Examples

library(magrittr)

add_item(input = {fl.idfs <-  0})
add_item(input = {
 util_idfs <- if(psa_bool){rnorm(1,0.8,0.2)} else{0.8}
 util.mbc <- 0.6
 cost_idfs <- 2500})
common_inputs <- add_item(input = {
pick_val_v(
  base      = l_statics[["base"]],
  psa       = pick_psa(
    l_statics[["function"]],
    l_statics[["n"]],
    l_statics[["a"]],
    l_statics[["b"]]
  ),
  sens      = l_statics[[sens_name_used]],
  psa_ind   = psa_bool,
  sens_ind  = sensitivity_bool,
  indicator = indicators_statics,
  names_out = l_statics[["parameter_name"]],
  deploy_env = TRUE #Note this option must be active if using it at add_item2
)
}
) 

WARDEN documentation built on Nov. 5, 2025, 7:45 p.m.