The results of a qgis output is always an output of the first calculation about rqgis

[jannes-m]

Jakub, thanks for pointing this out! I will have to look deeper into this. And yes, I guess, it seems as if it's the same problem as #74. Under Windows, one receives the expected result, though one has to use OUTPUT = file.path(tempdir(), "out.shp"), otherwise strange error messages occur...

Can you please run:

 qgis_session_info()

I have tried your code under Linux as well with QGIS 2.14.17, and here it works, i.e. nrow(points_in_nc2) yields 10.
Nevertheless, issue #74 remains. Hence, I need to write a python snippet, and submit it stack overflow.

[Nowosad]

library(RQGIS)     
qgis_session_info()
#> Assuming that your root path is '/usr'!
#> Warning in py_run_string_impl(code, local, convert): GDAL Message 4: Failed
#> to open /usr/share/qgis/python/plugins/processing/tests/data/points.shp,
#> Permission denied.
#> Error in file(con, "r"): invalid 'description' argument

It looks that there is some problem. I have no idea how to fix it yet.

[jannes-m]

Does it make any difference to run qgis_session_info() a second time? Or restarting R?

If this does not work, start the terminal, run sudo rstudio or sudo R, and then call qgis_session_info(). This should resolve the permission issue.

[Nowosad]

$qgis_version
[1] "2.18.10"

$gdal
[1] "2.1.3"

$grass6
character(0)

$grass7
[1] "7.2.1"

$saga
NULL

$supported_saga_versions
[1] "2.3.0" "2.3.1"

[jannes-m]

Perfect! Can you please update to 2.18.11 or 2.18.12, and check if your initial problem still exists. When I used 2.18.11 under Linux, the expected output appeared, i.e. in the first run 100 points and in the second run just 10.