Modify the value of existing items

Modify the value of existing items

modify_item(list_item, env_ch = NULL)

Arguments

list_item

A list of items and their values or expressions

env_ch

Environment in which to save list (should not be defined by user)

Details

The functions to add/modify events/inputs use lists. Whenever several inputs/events are added or modified, it's recommended to group them within one function, as it reduces the computation cost. So rather than use two modify_item with a list of one element, it's better to group them into a single modify_item with a list of two elements.

Examples

if (FALSE) {
modify_item(list(cost.idfs = 500, cost.tx = cost.tx + 4000))
}