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# +++++++++++++++++++++++++++++++++++++++++++++++++ application: ProjectileApp.R
# test Projectile with RK4
# originally uses Euler
# suppressMessages(library(data.table))
importFromExamples("Projectile.R") # source the class
ProjectileApp <- function(verbose = FALSE) {
# initial values
x <- 0; vx <- 10; y <- 0; vy <- 10
state <- c(x, vx, y, vy, 0) # state vector
dt <- 0.01
projectile <- Projectile()
projectile <- setState(projectile, x, vx, y, vy)
projectile@odeSolver <- init(projectile@odeSolver, 0.123)
# init(projectile) <- 0.123
projectile@odeSolver <- setStepSize(projectile@odeSolver, dt)
rowV <- vector("list")
i <- 1
while (getState(projectile)[3] >= 0) {
rowV[[i]] <- list(t = getState(projectile)[5],
x = getState(projectile)[1],
vx = getState(projectile)[2],
y = getState(projectile)[3], # vertical position
vy = getState(projectile)[4])
projectile <- step(projectile)
i <- i + 1
}
DT <- data.table::rbindlist(rowV)
return(DT)
}
solution <- ProjectileApp()
plot(solution)
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