How to view the source code of functions that are not exported in the R package

Question

I am following this tutorial and would like to use and view the source code of a function that is not exported. But it failed.

The name of this unexported function is diag(), which exists in the coxme package.

When I type coxme::diag() in Console, I can find that the function diag() does exist.

> coxme::diag()
Error: 'diag' is not an exported object from 'namespace:coxme'

But when I type coxme:::diag(), I can't find this function. I don't know why. In this tutorial, the author successfully to find the function by typing usethis:::base_and_recommended().

> coxme:::diag
Error: object 'diag' not found

coxme::diag() error doesn't tell you that the function exists in coxme : you'll get the same error with coxme::functionthatdoesntexist. If you search diagin coxme source, you'll see it's base::diag — Waldi
– Waldi, Commented Sep 17, 2022 at 4:35
@ Waldi, Thanks a lot. I posted a new question at: stackoverflow.com/questions/73752786/… — zhiwei li
– zhiwei li, Commented Sep 17, 2022 at 6:53

Nir Graham · Accepted Answer · 2022-09-21 14:17:00Z

2

library(coxme)
getAnywhere(diag)
getAnywhere(diag)[1]
showMethods(diag)

differing objects matching ‘diag’ were found
in the following places
  package:bdsmatrix
  package:base
  namespace:base
  namespace:Matrix
  namespace:bdsmatrix
Use [] to view one of them

standardGeneric for "diag" defined from package "base"

function (x = 1, nrow, ncol, names = TRUE) 
standardGeneric("diag")
<environment: 0x0000014df6d2a480>
Methods may be defined for arguments: x, nrow, ncol, names
Use  showMethods(diag)  for currently available ones.

Function: diag (package base)
x="ANY"
x="bdsmatrix"
x="CsparseMatrix"
x="diagonalMatrix"
x="gchol"
x="gchol.bdsmatrix"
x="indMatrix"
x="packedMatrix"
x="RsparseMatrix"
x="TsparseMatrix"
x="unpackedMatrix"

answered Sep 21, 2022 at 14:17

Nir Graham

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