Example RServe Flow
Introduction
This flow contains a basic example on how to use node-red-contrib-R-nodes to do statistical data analysis using R in node-RED.
The given example simulates some input data and calculates the median as well as the mean of the given data using R.
Requirements
In order of this flow to work, it is required to run a R server. This can be accomplished by running the Rserve
command within a R instance. For the communication between R and nodeRED it is also required to have the library RJSONIO
installed.
R-Code to start Rserve
# Rserve package and RJSONIO needs to be installed
# install.packages("Rserve")
# install.packages("RJSONIO")
library(Rserve)
Rserve(args="--no-save")
[{"id":"acba6ff9.cbc76","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"580cb2a.906064c","type":"inject","z":"acba6ff9.cbc76","name":"Demodata input","topic":"","payload":"{\"data\":[0.48,-5.21,-0.21,7.81,10.43,13.81,16.24,15.89,12.56,8.04,2.79,-0.11,-2.39,6.01,15.31,7.8,0.21,12.79,6.88]}","payloadType":"json","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":120,"y":140,"wires":[["a15cf396.5b792"]]},{"id":"a15cf396.5b792","type":"R Script","z":"acba6ff9.cbc76","RServer":"9cfb83f.b316c8","script":"msg$payload$mean = mean(msg$payload$data)\nmsg$payload$median = median(msg$payload$data)","name":"Calculate mean and median using R","x":390,"y":140,"wires":[["3b04d31c.d377dc"]]},{"id":"3b04d31c.d377dc","type":"debug","z":"acba6ff9.cbc76","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":650,"y":140,"wires":[]},{"id":"9ce7ac17.dfc6","type":"comment","z":"acba6ff9.cbc76","name":"Requirement: RServe","info":"In order of this flow to work, it is required to run a R server. This can be\naccomplished by running the `Rserve` command within a R instance. For the\ncommunication between R and nodeRED it is also required to have the library\n`RJSONIO` installed.\n\n## R-Code to start `Rserve`\n\n```\n# Rserve package and RJSONIO needs to be installed\n# install.packages(\"Rserve\")\n# install.packages(\"RJSONIO\")\n\nlibrary(Rserve)\nRserve(args=\"--no-save\")\n```","x":120,"y":40,"wires":[]},{"id":"9cfb83f.b316c8","type":"R Server","z":"","host":"127.0.0.1","port":"6311","name":"local R Server"}]