我正在尝试从 MASS 库中简单地使用 fitdistr 函数，并且它以下列方式失败：
fitdistr(rnorm(100), "normal")
"Error in substring(" ", 1L, (nchar(ans[2L, ]) - nchar(dn[[2L]]))%/%2)
: 4 arguments passed to .Internal(nchar) which requires 3
我更新了RStudio和我所有的R套餐，但仍然没有成功。
有人可以建议如何解决这个问题吗？
sessionInfo()
R version 3.2.0 (2015-04-16)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.11.2 (unknown)
locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] MASS_7.3-45
loaded via a namespace (and not attached):
[1] tools_3.2.0