[GRASS-user] Error in v.distance when running from R (in a container)

[Mehrdad Varedi]

Hi Markus,
Sorry I am getting back to a conversation we had more than a month ago. I
found the error on v.distance in R.

FYI, I run the same program under GRASS 7.8.3 with no problem, although
when the v.distance function is called from R under GRASS 7.9.dev I get the
following error:

*"ERROR: At least one of the following options is required: <output>,
<table> and <-p>>"*

Here is the code I use in R:

execGRASS("v.distance",parameters= list(
  from = NewLayerName,
  from_layer = "1",
  from_type = "point",
  to = BasePointLayer,
  to_layer = "1",
  to_type = "point",
  dmax = -1,
  dmin = -1,
  upload = "to_attr",
  column = NewRefColumn,
  to_column = UniqueID2BeTaken,
  separator = "tab"),
  flags=c('overwrite','verbose')
)

I still want to upload the results  to the selected column, not to a new
table. How can I make it work in GRASS 7.9.dev?
by the way,  the GRASS 7.8.3 is on my ubuntu computer, while the GRASS
7.9.dev is running in a docker container with the same OS.

I would appreciate to learn what should I add exactly to the command to
make it work with the new version of GRASS. If there is a bug that needs
some work , probably I should create a new container with the previous
version of GRASS. what do you recommend?

Kind regards,

Mehrdad


On Mon, May 25, 2020 at 5:12 AM Markus Neteler <neteler at osgeo.org> wrote:

> Hi Mehrdad,
>
> On Mon, May 25, 2020 at 10:24 AM Mehrdad Varedi <varedi at waterlix.com>
> wrote:
> >
> > Hi Everyone,
> > I can run the R program with no problem from a Shiny app I have in
> Rstudio. Although when running the program from a container, I receive an
> error when running the v.distance and program halts.
> >
> > here is the error dump I receive, not so much informative, although I
> appreciate to know if you have ever seen such an issue: (FYI many other
> grass functions are executed before this error happens)
> >
> > Warning: Error in execGRASS: The command:
> > v.distance --overwrite --verbose from=WM_End from_layer=1
> from_type=point to=WM_start to_layer=1 to_type=point dmax=0.5 dmin=-1
> upload=to_attr column=LinkedWMID to_column=WMAINID separator=tab
> > produced an error (1) during execution:
> > Finds the nearest element in vector map 'to' for elements in vector map
> 'from'.
> >
> > Usage:
> >  v.distance [-pas] from=name [from_layer=string]
> >    [from_type=string[,string,...]] to=name [to_layer=string]
> >    [to_type=string[,string,...]] [output=name] [dmax=value] [dmin=value]
> >    upload=string[,string,...] [column=name[,name,...]] [to_column=name]
> >    [table=name] [separator=character] [--overwrite] [--help] [--verbose]
> >    [--quiet] [--ui]
> >
> > Flags:
> >   -p   Print output to stdout, don't update attribute table
> >   -a   Calculate distances to all features within the threshold
> >   -s   Print output as square matrix (only possible for one single
> upload variable)
> >
> > Parameters:
> >         from   Name of existing vector map (from)
> >   from_layer   Laye [... truncated]
>
> ^--- and chance to expand this "truncated"? Exactly therein you will
> find the error message :-)
> It is in the last line of the truncated part.
>
> Best,
> Markus
>
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