Can someone explain what this code is doing?

JEREMY GONZALES 0
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Can someone explain what this code is doing? Like what it's setting or what the functions are doing. It is for an SIR model. Thank you

SIR <- function(time, state, parameters) {
      par <- as.list(c(state, parameters))
      with(par, {
      dS <- -beta/N * I * S
      dI <- beta/N * I * S - gamma * I
      dR <- gamma * I
     list(c(dS, dI, dR))
})
}
r
1 Answers

with function in R Documentation described in the following: Evaluate an R expression in an environment constructed from data, possibly modifying (a copy of) the original data. So,I think this function concatenate 'state' and 'parameters' into a vector and use as.list convert it to a list(par).The next operation is to operate on the par converted into a list.Then,the three variables of dS,dI,dR are established,But unfortunately, since I don't have the original data, I can't tell if it's an environment variable in the calculation or a column in par. Also,time is not used anywhere in the function, so I think your function may be incomplete

yiboliu0
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