I have set the repository in my user configuration file (?Startup). In my case, it resides in ~/.Rprofile:

unless --no-init-file was given, R searches for a user profile, a file of R code. The path of this file can be specified by the R_PROFILE_USER environment variable (and tilde expansion will be performed). If this is unset, a file called ‘.Rprofile’ is searched for in the current directory or in the user's home directory (in that order). The user profile file is sourced into the workspace.

Here is a snippet from my .Rprofile:

local({
    # CRAN -----------------------------------------------------------
    r <- getOption("repos")

    # RStudio Package Manager ----
    # paste(R.version$year, R.version$month, R.version$day, sep = "-")
    # set a CRAN mirror
    # repos.date <- "latest"
    # r["CRAN"] <- paste0("https://packagemanager.rstudio.com/cran/", repos.date)

    # Tsinghua mirror ------------
    r["CRAN"] <- "https://mirrors.westlake.edu.cn/CRAN"
    options(repos = r)

    # Bioconductor ---------------------------------------------------
    options(BioC_mirror = "https://mirrors.westlake.edu.cn/bioconductor")

    # cat("\nDefault CRAN mirror snapshot taken on ", repos.date, ".", sep = "")
    # cat("\n", "See: https://packagemanager.rstudio.com.", sep = "")
    cat("\nDefault CRAN mirror taken on: ", r["CRAN"], ".", sep = "")
    cat("\n\n")
})

Please note that the r command starts radian, while arf starts arf. However, arf does not read above code snippet.

arf ignore the user config file .Rprofile on Windows #18

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`arf` ignore the user config file `.Rprofile` on Windows #18