[R-sig-Geo] warnings and errors from grass to R via spgrass6GG

[Rainer M. Krug]

Roger Bivand <Roger.Bivand at nhh.no> writes:

> On Tue, 16 Apr 2013, Rainer M. Krug wrote:
>
>> Hi
>>
>> I am using spgrass6 with grass 7 and can report that it works so far
>> without problems.
>>
>> Nevertheless, I have one question, which I already had about grass 6.
>>
>> I am using execGRASS to execute grass commands as well as an own defined
>> function r.mapcalc [1].
>>
>> Now as these are used in a simulation script, I would like to (actually
>> need to know) when these functions fail.
>
> Rainer:
>
> Could you please create a simple test case with some built-in data set
> and initGRASS()? I see from ?system that some cases are addressed, but
> with intern=TRUE.

I'll investigate further and will send some examples using the spearhead
dataset.

Thanks,

Rainer

>
> Roger
>
>>
>> Is there a way that errors and warnings in GRASS will be reflected as
>> errors and warnings in R when tthe grass function is called via execGRASS?
>>
>> I am using Linux and R 3.0.0
>>
>> Thanks,
>>
>> Rainer
>>
>>
>> Footnotes:
>> [1] r.mapcalc is defined as follow:
>> --8<---------------cut here---------------start------------->8---
>> r.mapcalc <- function(
>>    ...,
>>    intern = TRUE,
>>    ignore.stderr = !options("asmDebug")[[1]],
>>    feedback = TRUE,
>>    flags = NULL
>>    ) {
>>    comm <- paste( "r.mapcalc ", " \"", ..., "\" ", sep="" )
>>    if (!is.null(flags)) {
>>      flags <- paste0("--", flags, collapse=" ")
>>    }
>>    comm <- paste(comm, flags)
>>    if (feedback) print(comm)
>>    system( comm, intern=intern, ignore.stderr=ignore.stderr )
>>  }
>> --8<---------------cut here---------------end--------------->8---
>>
>>
>>
>>
>>
>>
<#secure method=pgpmime mode=sign>

-- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

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