Hi 11atzitzi,
Please find below some useful information to connect R and KNIME.
In order for KNIME to run R commands on a local installation of R, it needs to know where the R installation is on the machine. The default path to the R installation is configured from the KNIME Preferences page (“File” -> “Preferences”->“KNIME”-> “R”. Then, you would need to click the “Browse” button and select the R installation directory.
Please, install also the following packages:
install.packages('Rserve')
install.packages('Cairo')
Hope that helps,
Best,
Vincenzo