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Represent an expression of value and variable

Source: R/RcppExports.R
Expression.Rd

The objects of this class are polynomial expression of variables and values built by using the binary operators +, -, and * with the usual semantics.

An expression is one of the following object:

  • a variable;

  • a numeric value, e.g., 3.4;

  • the sum of two expressions;

  • the subtraction of two expressions;

  • the multiplication of two expressions.

See also

Variable

Examples

# build a simulation and add two species to it
# set the seed of the random number generator
set.seed(0)

# create a simulation
sim <- SpatialSimulation()
sim$add_mutant(name = "A",
               growth_rates = 0.2,
               death_rates = 0.1)

# build an expression
sim$var("A") - 2 * sim$var("Time") * sim$var("A.duplications") + 3.4
#> |A|-2*Time*|A.duplications|+3.4

# R variables storing logic variables can also be used in expressions
v_time <- sim$var("Time")
sim$var("A") - 2 * v_time * sim$var("A.duplications") + 3.4
#> |A|-2*Time*|A.duplications|+3.4

# the logic expression can be stored in an R variable
v_exp <- sim$var("A") - 2 * v_time * sim$var("A.duplications") + 3.4
v_exp
#> |A|-2*Time*|A.duplications|+3.4