QGIS：如何直接在python控制台中运行R？

Question

I have been using QGIS python console to automate my needs. I've used a few processing algorithms (such as distance matrix) to work on my vector layers which outputs csv files.I need R to work on these files before bringing them back to my python console as variables.

Is there a way I can run R directly through the python console (maybe using packages such as rpy2?)

Answer 1

I guess you can easily interact with a R instance in the QGis python console using rpy2 . Try these following lines of code in the QGIS python console:

>>> import rpy2.rinterface as rinterface
>>> rinterface.set_initoptions((b'rpy2', b'--no-save'))
>>> rinterface.initr()
0
>>> from rpy2.robjects.packages import importr
>>> import rpy2.robjects as robjects

You can now interact with R like this :

>>> robjects.r("""seq(1,12);""")
<IntVector - Python:0x7fa5f6e4abd8 / R:0x769f4a8>
[       1,        2,        3, ...,       10,       11,       12]

Or import some libraries for example :

>>> rutils = importr("utils")
>>> rgraphics = importr('graphics')

Take a look at the documentation of Rpy2 , I have successfully used these methods to run some personals scripts or some libraries installed from the CRAN (running multiple statements in robjects.r("""...""") and grabbing the output in a python variable to use in QGIS).

(If i remember well, on windows I had to set some environnement variables first, like R_HOME or R_USER maybe)

Also, if you haven't seen it, take a look at this page of the QGIS documentation : 17.31. Use R scripts in Processing . It offers a convenient way to use your existing R script with some slight add.