Re: [Rd] "could not find function" after import

From: steven mosher <>
Date: Fri, 23 Sep 2011 09:57:45 -0700


I have a related question.

I need one function from R.utils. But R.utils depends on R.oo and R.methodsS3. so I made R.util an import and then used importFrom() in the namespace.

The package passed the "check". However when it came to use the function it had not been loaded? do I need to add the upstream packages that R.util depends
upon? also in the code do I need a library or require?

A bit confused


On Mon, Sep 19, 2011 at 5:09 PM, Duncan Murdoch <> wrote:
> On 11-09-19 4:48 PM, Stephanie M. Gogarten wrote:
>> I am trying to build a package (GWASTools, submitted to Bioconductor)
>> that uses the "sandwich" package.  I have references to "sandwich" in
>> Imports: methods, DBI, RSQLite, sandwich, survival, DNAcopy
>> import(sandwich)
>> In the code itself is a call to vcovHC:
>> Vhat<- vcovHC(mod, type="HC0")
>> I have sandwich version 2.2-7 installed.
>> When I run R CMD check on my package, I get the following error during
>> checking of examples:
>> * using R Under development (unstable) (2011-08-29 r56828)
>> * using platform: x86_64-apple-darwin9.8.0 (64-bit)
>> ...
>> * checking examples ... ERROR
>> ...
>> Error in estfun.glm(x) : could not find function "is.zoo"
>> Calls: assocTestRegression ... meatHC ->  rowMeans -> ->
>> estfun ->  estfun.glm
>> I import sandwich, sandwich depends on zoo, but a function in zoo cannot
>> be found during execution.
>> I tried to get around this by explicitly including a "require" statement
>> in assocTestRegression:
>> require(sandwich)
>> The example now runs, but I have a warning in R CMD check:
>> * checking for unstated dependencies in R code ... WARNING
>> ‘library’ or ‘require’ call not declared from: ‘sandwich’
>> I am not sure why this is a problem, as there is a "require" statement
>> (for a different package) in another function which does not cause any
>> warnings.
>> Can anyone advise on how to get my package to successfully pass R CMD
>> check?
> If you said that your package Depends on sandwich, you'd probably pass
> checks, but this is arguably a bug in the sandwich package.
> The problem is that since you only import sandwich, it never gets attached.
>  So it never attaches its dependency zoo.   It should import zoo (or import
> the functions in zoo that it uses) to work properly the way you are calling
> it.
> You can see the same error as follows:
> 1.  Install sandwich, but don't attach it or zoo.
> 2.  Run
> example(glm)
> to create the "glm" object glm.D93.
> Try to call
> sandwich::estfun(glm.D93)
> You'll get the same error as before because is.zoo() will not be loaded.
> It's also arguably a design flaw in R.  For testing sandwich, zoo would
> generally end up being attached, because the testing of sandwich would
> attach it.  However, examples like the one above are never tested.
> Duncan Murdoch
> ______________________________________________
> mailing list
> mailing list Received on Fri 23 Sep 2011 - 17:00:33 GMT

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