Internal deSolve Functions
Internal deSolve functions, these are not to be called by the user.
timestep(prev = TRUE)
prev |
if |
Function timestep is intended to return the current or next
timestep of the integration. It works only under specific
circumstances and should not be used by the end user.
Instead of this, please see the example below for a pure R solution.
diagnostics for information about the time steps used,lagvalue and lagderiv that can be used for DDEs.
###################################################
### This example shows how to retrieve information
### about the used time steps.
###################################################
## a function closure ('lexical scoping')
modelClosure <- function(t0) {
t.old <- t.act <- t0
function(t, y, parms) {
t.old <<- t.act
t.act <<- t
cat(t, "\t", t - t.old, "\n")
with (as.list(c(y, parms)), {
dP <- a * P - b * P * K
dK <- b * P * K - c * K
list(c(dP, dK))
})
}
}
model <- modelClosure(0) # initialization
parms <- c(a = 0.1, b = 0.1, c = 0.1)
y <- c(P = 1, K = 2)
out <- ode(y = y, func = model, times = c(0, 2),
parms = parms, method = "lsoda")
ls() # prove that t.old and t.new are local within 'model'Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.