node-red-contrib-R-nodes
A set of nodes which allows you to use the statistical computing language R in node RED.
Installation
Execute npm install @innetmonitoring/node-red-contrib-r-nodes
inside your
Node RED root directory.
Setup your R-Server
Install R on the computer you'd like to use as the R server. It can be downloaded on the R Project Website.
After installation of R install all requirements/libraries required for the remote code execution. Start R and execute the following commands:
install.packages('RJSONIO')
install.packages('Rserve')
Start your R-Server
Start the R interpreter and run the following commands to start Rserve
.
library(Rserve)
Rserve()
Available Nodes
R Server
This is a configuration node to set up a connection to a host running R and RServe.
R Script
The R Script node provides the possibility to write R code directly
in node RED. When the node receives a msg
it is copied to the R server and
your script is executed afterwards. You can manipulate the msg
object
with default R code. After the code is successfully executed, the msg
object
is copied back to node red and emitted at the nodes output.
Sample R code
Here is some sample code on how to access the msg
object in R:
data <- msg$payload$data;
msg$payload$mean <- mean(data);
msg$payload$median <- median(data);
Caution:
The variable type is not converted by this node. You have to make sure, the
data types of the members you want to access or manipulate are represented by
the correct datatype (e.g. array of floats).
Example
A working example flow can be found on the nodeRED flow repository.