These instructions assume you are using R 2.14.0 or later.
STEP 1
The download package containing the H2O jar file can be obtained by visiting H2O available downloads at http://0xdata.com/downloadtable.
Choose the version of H2O best for you, and unzip the downloaded H2O zip file. The most recent promoted build is reccomended.
STEP 2
Start an instance of H2O. For help with this see Getting Started from a Downloaded Zip File
Users should be aware that in order for H2O to successfully run through R, an instance of H2O must also simultaneously be running. If the instance of H2O is stopped, the R program will no longer run, and work done will be lost.
STEP 3:
New users may skip this step, while users who have previously installed the H2O R packages should uninstall them by entering the following commands to the R console:
detach("package:h2o", unload=TRUE)
remove.packages("h2o")
Note: users may get warnings of the type “Error in detatch(“package:h2o”, unload = TRUE): invalid ‘name’ argument. This tells users that there is no H2O package to uninstall. These warnings can safely be ignored.
STEP 4:
Install the H2O package, and the H2O client package via the H2O cran. This repository functions exactly like the R repository, but is maintained by H2O.
install.packages("h2o", repos=(c("http://h2o-release.s3.amazonaws.com/h2o/rel-jacobi/2/R", getOption("repos"))))
STEP 4:
Once the H2O R package has been installed, call the package, and establish a connection to a running instance of H2O.
If there is no running instance of H2O prior to using the command “h2o.init()”, H2O in R will start an instance automatically for the user.
Note that in the call “localH2O <- h2o.init()” the h2o.init object is being named localH2O in the R environment for use later in model specification. Entering the call exactly as it is written below assumes the user wishes to connect to IP localhost and port: 54321.
library(h2o)
localH2O <- h2o.init()
Users who wish to specify a connection with a server (rather than localhost at port 54321) must explicity state the IP address and port number in the h2o.init call. An example is given below, but do not cut and paste; users should specify the IP and port number appropriate to their specific environment.
library(h2o)
localH2O = h2o.init(ip = "192.555.1.123", port = 12345, startH2O = FALSE)
STEP 5: Upgrading Packages
Users may wish to manually upgrade their R packages. For instance, if you are running the bleeding edge developer build, it’s possible that the code has changed, but that the revision number has not, in which case manually upgrading ensures the most current version of not only the H2O code, but the corresponding R code as well.
This can be done by returning to STEP 3, and following the commands through STEP 4.