Couldn't find stan() in R witn Stan

Modeling
,
1

I do Bayesian statistics programming in R with Stan, but the console couldn’t find the function “stan”. There is an error in the code

stanfit <- stan(file=scr, model_name=scr, data=data, pars=par, verbose=F,seed=see, chains=cha, warmup=war,iter=ite)

the whole code as follows.

library(rstan)
library(rstanarm)
library(loo)
library(bayesplot)
library(ggplot2)
options(mc.cores = paralles::detectCores())
scr <- "modelbeforeafter.stan"
source("databeforeafter.R") 
data <- list(N=N,xA=xA,xB=xB)
par <-c("muA","muB", "SigmaA","SigmaB","log_likA","log_likB","rhoA", "rhoB","deltaA","deltaB","es","deltaA_over","deltaB_over","es_over","delta_r","delta_r_over")
war <- 1000 
ite <- 11000 
see <- 1234 
dig <- 3 
cha <- 1 
stanfit <- stan(file=scr, model_name=scr, data=data, pars=par, verbose=F,seed=see, chains=cha, warmup=war,iter=ite)
loo1 <- rstan:::loo.stanfit
2

The function stan() is an exported object from the package rstan.

Please add

library(rstan)

into your code.

3

Thank you so much for answering my question, but the console could not find function stan, even though I write the code library(rstan). I have already loaded rstan package in R with stan.