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# ++++++++++++++++++++++++++++++++++++++++++++++++++ example: PendulumApp.R
# Simulation of a pendulum using the EulerRichardson ODE solver
suppressPackageStartupMessages(library(ggplot2))
importFromExamples("Pendulum.R") # source the class
PendulumApp <- function(verbose = FALSE) {
# initial values
theta <- 0.2
thetaDot <- 0
dt <- 0.1
pendulum <- Pendulum()
# pendulum@state[3] <- 0 # set time to zero, t = 0
pendulum <- setState(pendulum, theta, thetaDot)
pendulum <- setStepSize(pendulum, dt = dt) # using stepSize in RK4
pendulum@odeSolver <- setStepSize(pendulum@odeSolver, dt) # set new step size
rowvec <- vector("list")
i <- 1
while (getState(pendulum)[3] <= 40) {
rowvec[[i]] <- list(t = getState(pendulum)[3], # time
theta = getState(pendulum)[1], # angle
thetadot = getState(pendulum)[2]) # derivative of angle
pendulum <- step(pendulum)
i <- i + 1
}
DT <- data.table::rbindlist(rowvec)
return(DT)
}
# show solution
solution <- PendulumApp()
plot(solution)
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