Displaying 3 results from an estimated 3 matches for "drdt".
Did you mean:
drdb
2017 Jun 21
4
How to apply a system of ordinary differential equations to a cell grid?
...ntial equations (ODEs). Here is an example to represent the system of ODEs:
solve_sir_model <- function (times, parameters) {
sir_model <- function (times, states, parameters) {
with(as.list(c(states, parameters)), {
dSdt <- -beta*S*I
dIdt <- beta*S*I-gamma*I
dRdt <- gamma*I
dNdt <- dSdt + dIdt + dRdt
return(list(c(dSdt, dIdt, dRdt, dNdt)))
})
}
states <- c(S = 99, I = 1, R = 0, N = 100)
return(ode(y = states, times = times, func = sir_model, parms = parameters))
}
require(deSolve)
output <- as.data.frame(solve_sir_model...
2017 Jul 17
0
How to apply a system of ordinary differential equations to a cell grid?
...erstand why it doesn't work with one time step:
solve_sir_model <- function (times, parameters) {
sir_model <- function (times, states, parameters) {
with(as.list(c(states, parameters)), {
dSdt <- -beta*S*I
dIdt <- beta*S*I-gamma*I
dRdt <- gamma*I
dNdt <- dSdt + dIdt + dRdt
return(list(c(dSdt, dIdt, dRdt, dNdt)))
})
}
states <- c(S = 99, I = 1, R = 0, N = 100)
return(ode(y = states, times = times, func = sir_model, parms = parameters, method = "iteration"))
}...
2017 Jun 21
0
How to apply a system of ordinary differential equations to a cell grid?
...represent the system of ODEs:
>
> solve_sir_model <- function (times, parameters) {
>
> sir_model <- function (times, states, parameters) {
>
> with(as.list(c(states, parameters)), {
>
> dSdt <- -beta*S*I
> dIdt <- beta*S*I-gamma*I
> dRdt <- gamma*I
> dNdt <- dSdt + dIdt + dRdt
>
> return(list(c(dSdt, dIdt, dRdt, dNdt)))
>
> })
> }
>
> states <- c(S = 99, I = 1, R = 0, N = 100)
> return(ode(y = states, times = times, func = sir_model, parms = parameters))
> }
>
> requi...