[R-sig-Geo] Error with gstat::predict [SEC=UNCLASSIFIED]

[Edzer Pebesma]

On 31/10/16 09:12, Roger Bivand wrote:
> On Mon, 31 Oct 2016, Edzer Pebesma wrote:
> 
>>
>>
>> On 31/10/16 05:09, Li Jin wrote:
>>> Hi All,
>>>
>>> I need to use the predict{gstat} function in one of my functions for
>>> a R package. I use RStudio to make the package. When I specified
>>> gstat::predict in the function, I received the following error:
>>>
>>> Error: 'predict' is not an exported object from 'namespace:gstat'
>>
>> gstat exports 'predict' as an S3method; if it would export 'predict' as
>> an object, this would hide the generic in package stats.
>>
>> The solution to your problem is to not put prepend 'predict' with
>> gstat::, but instead rely on S3 method dispatch.
> 
> Is it possible that the OP is not importing correctly in the NAMESPACE
> file of the package in question?

Indeed: your package should load (import):

1. predict from package stats, if it wants to use predict
2. package gstat if it wants to use the predict method for gstat objects.
3. use stats::predict rather than gstat::predict if you'd insist on
prepending package:: to a generic

> 
> Roger
> 
>>
>> The actual, un-exported function called is gstat:::predict.gstat, but it
>> is discouraged to call that directly.
>>
>>>
>>> The session information is:
>>>
>>>> sessionInfo()
>>>
>>> R version 3.3.1 (2016-06-21)
>>>
>>> Platform: x86_64-w64-mingw32/x64 (64-bit)
>>>
>>> Running under: Windows 7 x64 (build 7601) Service Pack 1
>>>
>>>
>>>
>>> locale:
>>>
>>> [1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252
>>>
>>> [3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C
>>>
>>> [5] LC_TIME=English_Australia.1252
>>>
>>>
>>>
>>> attached base packages:
>>>
>>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>>
>>>
>>>
>>> other attached packages:
>>>
>>> [1] myrpackage_0.0.0.9000 devtools_1.12.0
>>>
>>>
>>>
>>> loaded via a namespace (and not attached):
>>>
>>> [1] tools_3.3.1   withr_1.0.2   memoise_1.0.0 digest_0.6.10
>>>
>>> Is this a bug? Any suggestions? Many thanks in advance!
>>>
>>> Kind regards,
>>> Jin
>>>
>>> Jin Li, PhD
>>> Spatial Modeller/Computational Statistician  |  National Earth and
>>> Marine Observations
>>> Environmental Geoscience Division  |  GEOSCIENCE AUSTRALIA
>>> ____________________________________________________________
>>> Phone:  +61 2 6249 9899    Fax:  +61 2 6249 9999
>>> Email:  Jin.Li at ga.gov.au<mailto:Jin.Li at ga.gov.au>    Web: 
>>> www.ga.gov.au<http://www.ga.gov.au/>
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>>
>>
> 

-- 
Edzer Pebesma
Institute for Geoinformatics  (ifgi),  University of Münster
Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 33081
Journal of Statistical Software:   http://www.jstatsoft.org/
Computers & Geosciences:   http://elsevier.com/locate/cageo/

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