R help - Oct 2020 - raster::levels() not working in packaged function.

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'


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

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Maybe including

import(raster)

or

importFrom("raster", "levels")

in the package NAMESPACE would help.

Cheers,

Marcelino

El 31/10/2020 a las 13:24, nevil amos escribi?:
> 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'
>
>
> 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]]
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> .

-- 
Marcelino de la Cruz Rot
Depto. de Biolog?a y Geolog?a
F?sica y Qu?mica Inorg?nica
Universidad Rey Juan Carlos
M?stoles Espa?a

Many thanks,

That worked, since the NAMESPACE file incudes a warning about editing it
directly I ysed the reoygen tag in the fucntion script
#' @import raster.

On Sun, 1 Nov 2020 at 00:18, Marcelino de la Cruz Rot <
marcelino.delacruz at urjc.es> wrote:
> Maybe including
>
> import(raster)
>
> or
>
> importFrom("raster", "levels")
>
> in the package NAMESPACE would help.
>
> Cheers,
>
> Marcelino
>
> El 31/10/2020 a las 13:24, nevil amos escribi?:
> > 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'
> >
> >
> > 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]]
> >
> > _______________________________________________
> > R-sig-Geo mailing list
> > R-sig-Geo at r-project.org
> > https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> > .
>
>
> --
> Marcelino de la Cruz Rot
> Depto. de Biolog?a y Geolog?a
> F?sica y Qu?mica Inorg?nica
> Universidad Rey Juan Carlos
> M?stoles Espa?a
>
>
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