object 'Cdqrls' not found when building R packages using devtools

Question

I got an error as the title shows

Error: object 'Cdqrls' not found

I use devtools for building R packages, and one function in my current package, I used

.Call(Cdqrls, x[, id1, drop=FALSE] * w, w * z, epsilon)

and also includes a lm.c file in the src folder, which includes:

... SEXP Cdqrls(SEXP x, SEXP y, SEXP tol) { SEXP ans, ansnames; SEXP qr, coefficients, residuals, effects, pivot, qraux; int n, ny = 0, p, rank, nprotect = 4, pivoted = 0; double rtol = asReal(tol), *work; ...

directly copied from R source files. When I used load_all() in devtools, it compiles shared objects in src/ (I checked that works well) with new files: lm.o and MyPkgName.so. However, from the wiki of devtools, I found that

load_all ignores the package NAMESPACE

If working properly, I think by running some functions, I am able to update the NAMESPACE file to contain useDynLib(MyPkgName, Cdqrls). Is that correct? I think in that way the error may disappear... Any suggestions are greatly appreciated!

Update

According to @mnel and this post, it seems that using @useDynLib should work. However, the function I used .Call() is NOT documented, and there are several functions that used .Call so I personally do not wanna document them as they're not used for end-users. Thus, where shall I put @useDynLib?

Are you using roxygen to create your package? if so stackoverflow.com/questions/8407615/… — mnel
– mnel, Commented Apr 9, 2013 at 0:41
@mnel: thanks! I am using roxygen2. I read the post you mentioned, and it seems that @ useDynLib is the one to use. Please see the updated post above ;-) — alittleboy
– alittleboy, Commented Apr 9, 2013 at 1:08
More likely @useDynLib yourpackagename, or @useDynLib stats if you want to use Cdqrls from the stats package.... — mnel
– mnel, Commented Apr 9, 2013 at 1:45
@mnel: thanks! I used @ useDynLib pkgname Cdqrls and it works now ;-) — alittleboy
– alittleboy, Commented Apr 9, 2013 at 2:42

alittleboy · Accepted Answer · 2013-04-09 02:47:12Z

The answer is to use @useDynLib PkgName Routine1 Routine2 using roxygen2, so that once running document() function in devtools the NAMESPACE file will contain useDynLib(PkgName,Routine1,Routine2), which will work perfectly.

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