Bayesian Network with R - r

Question

I am trying to build a Bayesian network model. However I am unable to install a suitable package. Tried gRain, bnlearn and Rgraphviz for plotting. I have tried in R 2.15 and 3.2
Following are the error messages :
library(gRain)
Loading required package: gRbase
Loading required package: graph
Error: package ‘graph’ could not be loaded
In addition: Warning message:
In library(pkg, character.only = TRUE, logical.return = TRUE, lib.loc = lib.loc) :
there is no package called ‘graph’
> install.packages("graph")
Warning message:
package ‘graph’ is not available (for R version 2.15.3)
Same for R 3.2.1
> install.packages("graph")
(as ‘lib’ is unspecified)
Warning message:
package ‘graph’ is not available (for R version 3.2.1)
> install.packages("Rgraphviz")
(as ‘lib’ is unspecified)
--- Please select a CRAN mirror for use in this session ---
Warning messages:
1: In open.connection(con, "r") : unable to resolve 'cran.r-project.org'
2: package ‘Rgraphviz’ is not available (for R version 3.2.1)
> install.packages("Rgraphviz")
(as ‘lib’ is unspecified)
Warning message:
package ‘Rgraphviz’ is not available (for R version 2.15.3)
Other info for the model
1) No of variables - 17
2) Type of variables - discrete/continuous

Answer 1

The packagesgraph, RBGL and Rgraphviz are not on CRAN but on bioconductor.
To install these packages, execute
if (!requireNamespace("BiocManager", quietly = TRUE))
install.packages("BiocManager")
BiocManager::install(c("graph", "RBGL", "Rgraphviz"))
Then install the packages from CRAN in the usual way:
install.packages("gRain", dependencies=TRUE)
See also the gRain installation instructions.

Answer 2

For R version 3.5 or greater, you can install Bioconductor packages using BiocManager.
Please see: https://bioconductor.org/install.
I installed them using the following code:
if (!requireNamespace("BiocManager", quietly = TRUE))
install.packages("BiocManager")
BiocManager::install(version = "3.10")
BiocManager::install(c("gRbase", "RBGL", "Rgraphviz", "gRain"))