Re: [GRASS-user] rgrass7 syntax for passing a command

[Blumentrath, Stefan]

Hi again,

On a second look I tried:

execGRASS("v.in.ascii", flags="n", input="-", output=" outlet1", 
Sys_input="636645|218835")

That worked for me on Ubuntu...

Cheers
Stefan

-Original Message-
From: grass-user [mailto:grass-user-boun...@lists.osgeo.org] On Behalf Of Roger 
Bivand
Sent: 29. april 2016 09:18
To: grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] rgrass7 syntax for passing a command

Simply, don't.

execGRASS() is for executing single GRASS commands, not a drop-in replacement 
for bash.

Try something like creating the point in R with the correct projection, and 
write that vector object to your mapset:

library(sp)
library(rgrass7)
pt <- SpatialPointsDataFrame(matrix(c(636645, 218835), ncol=2),
  proj4string=CRS(paste(execGRASS("g.proj", flags="j", intern=TRUE), collapse=" 
")),
  data=data.frame(x=1))
writeVECT(pt, "outlet")

You could create a temporary text file to read in:

tf <- tempfile()
writeLines("636645, 218835", tf)
execGRASS("v.in.ascii", input=tf, output="outlet1", separator=",",
flags="n")

which is closer to your script but less natural.

Yes, grass-stats is a more appropriate list.
 
Roger




-
Roger Bivand
NHH Norwegian School of Economics, Bergen, Norway
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Re: [GRASS-user] rgrass7 syntax for passing a command

[Roger Bivand]

Simply, don't.

execGRASS() is for executing single GRASS commands, not a drop-in
replacement for bash.

Try something like creating the point in R with the correct projection, and
write that vector object to your mapset:

library(sp)
library(rgrass7)
pt <- SpatialPointsDataFrame(matrix(c(636645, 218835), ncol=2), 
  proj4string=CRS(paste(execGRASS("g.proj", flags="j", intern=TRUE),
collapse=" ")),
  data=data.frame(x=1))
writeVECT(pt, "outlet")

You could create a temporary text file to read in:

tf <- tempfile()
writeLines("636645, 218835", tf)
execGRASS("v.in.ascii", input=tf, output="outlet1", separator=",",
flags="n")

which is closer to your script but less natural.

Yes, grass-stats is a more appropriate list.
 
Roger




-
Roger Bivand
NHH Norwegian School of Economics, Bergen, Norway
--
View this message in context: 
http://osgeo-org.1560.x6.nabble.com/rgrass7-syntax-for-passing-a-command-tp5263330p5263427.html
Sent from the Grass - Users mailing list archive at Nabble.com.
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Re: [GRASS-user] rgrass7 syntax for passing a command

[Blumentrath, Stefan]

Hi Jim,

Although this does not solve you pipe issue (you might need to use pipe or fifo 
(run: help(pipe) in R for more info) :
If you just want to create a map with one point you could also use “v.edit» in 
non interactive mode (I guess), meaning, create a map and add a point.
Or you write your coordinates to a temporary file, which you can read in 
v.in.ascii

Cheers
Stefan

From: grass-user [mailto:grass-user-boun...@lists.osgeo.org] On Behalf Of 
Veronica Andreo
Sent: 28. april 2016 19:38
To: James Maas (MED) <j.m...@uea.ac.uk>
Cc: grass-user <grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] rgrass7 syntax for passing a command

Hello Jim,

Maybe you should write to grass-stats mailing list, too. Perhaps someone there 
can provide useful insights/suggestions for your case

Best,
Vero

2016-04-28 12:53 GMT-03:00 Jim Maas <j.m...@uea.ac.uk<mailto:j.m...@uea.ac.uk>>:
Using GRASS 7.0.3 on Ubuntu Linux,

I'm attempting to recreate the example of r.stream.distance shown at
https://grass.osgeo.org/grass70/manuals/addons/r.stream.distance.html

by passing these comands to GRASS from within an R session.  I can't figure out 
the correct syntax to pass this command to the system and also GRASS, any 
suggestions ?

The original code for GRASS command line in the example is

# Create outlet
echo "636645,218835" | v.in.ascii -n input=- output=outlet separator=","


I've tried lots of combinations of both system() and execGRASS() including this

system(message ("327500.00,523896.55") | "v.in.ascii", input="-", 
output="outlet", separator=",", flags=c("n", "overwrite"))




but have been unsuccessful.

Any suggestions?

Thanks, J

--
Dr. Jim Maas
Norwich Medical School

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Re: [GRASS-user] rgrass7 syntax for passing a command

[Veronica Andreo]

Hello Jim,

Maybe you should write to grass-stats mailing list, too. Perhaps someone
there can provide useful insights/suggestions for your case

Best,
Vero

2016-04-28 12:53 GMT-03:00 Jim Maas :

> Using GRASS 7.0.3 on Ubuntu Linux,
>
> I'm attempting to recreate the example of r.stream.distance shown at
> https://grass.osgeo.org/grass70/manuals/addons/r.stream.distance.html
>
> by passing these comands to GRASS from within an R session.  I can't
> figure out the correct syntax to pass this command to the system and also
> GRASS, any suggestions ?
>
> The original code for GRASS command line in the example is
>
> # Create outlet
> echo "636645,218835" | v.in.ascii -n input=- output=outlet separator=","
>
>
> I've tried lots of combinations of both system() and execGRASS() including
> this
>
> system(message ("327500.00,523896.55") | "v.in.ascii", input="-",
> output="outlet", separator=",", flags=c("n", "overwrite"))
>
>
>
>
> but have been unsuccessful.
>
> Any suggestions?
>
> Thanks, J
>
> --
> Dr. Jim Maas
> Norwich Medical School
>
> ___
> grass-user mailing list
> grass-user@lists.osgeo.org
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[GRASS-user] rgrass7 syntax for passing a command

[Jim Maas]

Using GRASS 7.0.3 on Ubuntu Linux,

I'm attempting to recreate the example of r.stream.distance shown at
https://grass.osgeo.org/grass70/manuals/addons/r.stream.distance.html

by passing these comands to GRASS from within an R session.  I can't 
figure out the correct syntax to pass this command to the system and 
also GRASS, any suggestions ?


The original code for GRASS command line in the example is

# Create outlet
echo "636645,218835" | v.in.ascii -n input=- output=outlet separator=","


I've tried lots of combinations of both system() and execGRASS() 
including this


system(message ("327500.00,523896.55") | "v.in.ascii", input="-", 
output="outlet", separator=",", flags=c("n", "overwrite"))





but have been unsuccessful.

Any suggestions?

Thanks, J

--
Dr. Jim Maas
Norwich Medical School

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