Create step function

Create a step function that jumps from zero to a specified height at a specified time, and remains at that height until the end of the simulation time.

Usage

step(start, height = 1)

Arguments

start

Start time of step

height

Height of step, defaults to 1

Value

Interpolation function

Details

Equivalent of Step() in Insight Maker

See also

ramp(), pulse(), seasonal()

Other input: pulse(), ramp(), seasonal()

Examples

# Create a simple model with a step function
# that jumps at time 50 to a height of 5
sfm <- xmile() |>
  build("a", "stock") |>
  build("input", "constant", eqn = "step(50, 5)") |>
  build("inflow", "flow", eqn = "input(t)", to = "a")

sim <- simulate(sfm, only_stocks = FALSE)
plot(sim)


# Negative heights are also possible
sfm <- build(sfm, "input", eqn = "step(50, -10)")

sim <- simulate(sfm, only_stocks = FALSE)
plot(sim)