Declare a random variable

The variable is not a decision: the solver is handed its value rather than choosing it, and every use of it means the same sample within a scenario. Two independent random variables are two declarations under two names.

Usage

rand_var(m, name, dist = NULL)

add_rand_var(m, name, dist = NULL)

Arguments

m

A model().

name

The random variable's name, unique within the model.

dist

A distribution() such as normal(100, 15), or an empirical() column holding one observed value per scenario. May be left NULL and supplied later with set_distribution().

Value

The random variable's handle (an expression of length 1).

add_rand_var returns the model, invisibly.

Details

A random variable takes no bounds and no domain — its distribution already says what values it takes.