[R-sig-Geo] raster::levels() not working in packaged function.

[Edzer Pebesma]

On 10/31/20 1:24 PM, nevil amos wrote:
> Apologies, I cannot see how to make a rero for this issue.
> 
> I have a function that uses levels(r) tor return the RAT of a raster "r"
> when the function is sourced from a script
> source(".\R\function.r")
> it works fine.
> when the function is built into a package and sourced from there
> library(mypackage) using the same script file to make the package
> levels(r)[[1]]
> the same line throws an error, as levels(myraster returns NULL
> 
> If I modify the script to include the raster namespace:
> raster::levels(r)[[1]]
> Then I get the error
>   Error: 'levels<-' is not an exported object from 'namespace:raster'

The error suggests that you are trying to assign levels, rather than 
retrieve them.

> 
> 
> I have also tried just using levels(r) and putting raster as a depends
> rather than an import in the DESCRIPTION file for the package, this does
> not solve the error.
> 
> 
> Any suggestions on how to overcome the problem?
> 
> many thanks
> 
> Nevil Amos
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics
Heisenbergstrasse 2, 48149 Muenster, Germany
Phone: +49 251 8333081