[R-pkg-devel] “unable to find an inherited method” error in choroplethr package

[Uwe Ligges]

Has this been resolved now?

I cannot reproduce the problem as I get:

 > library(choroplethr)
 >
 > ?get_state_demographics
starting httpd help server ... done
 >
 > get_state_demographics()
Error in (function (classes, fdef, mtable)  :
   unable to find an inherited method for function ‘geography’ for 
signature ‘"logical"’
In addition: Warning message:
In acs::acs.fetch(geography = state_geo, table.number = "B03002",  :
   'key' required to access Census API site for download;
   See http://www.census.gov/developers/ to request a key
   and/or use 'key=' (or run 'api.key.install()') to avoid this error.


Best,
Uwe Ligges



On 25.03.2016 21:55, arilamstein at gmail.com wrote:
> Recently the functionality in the choroplethr
> <https://cran.r-project.org/web/packages/choroplethr/index.html> package
> that depends on the acs
> <https://cran.r-project.org/web/packages/acs/index.html> package has
> stopped working. I've been able to narrow down the cause, but cannot figure
> out how to fix it. Any help would be appreciated. To reproduce the error
> you can type:
>
> install.packages("choroplethr")
>
> library(choroplethr)
>
> ?get_state_demographics
>
> get_state_demographics()
>
> Error in (function (classes, fdef, mtable)  :
>
> unable to find an inherited method for function ‘geography’ for signature
> "matrix"’
>
> (Note: you will need to set a census API key for this example to "work".
> See here
> <https://cran.r-project.org/web/packages/choroplethr/vignettes/e-mapping-us-census-data.html>
> for instructions).
>
> I believe that this error was introduced by version 2.0 of the acs package,
> which was just released. I suspect that choroplethr is either not importing
> something that it should be importing, or acs is not exporting something
> that it should be exporting. For example, the problem can be fixed by
> simply loading the acs package first:
>
> library(acs)
>
> get_state_demographics()
>
> <valid result>
>
> The acs package uses both S3 and S4, which I do not have much experience
> with. I have been reading Hadley's excellent chapter on Namespaces
> <http://r-pkgs.had.co.nz/namespace.html>, and tweaked various import
> directives in the choroplethr package (the actual code that crashes is here
> <https://github.com/arilamstein/choroplethr/blob/master/R/get_state_demograhpics.R#L42>).
> But I am still not sure how to fix this problem.. Any help would be
> appreciated.
>
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