K Kuck: Created page with "= General information = rjags is an R interface to use JAGS, [https://mcmc-jags.sourceforge.io/ Just another Gibbs Sampler], a program for analysis of Bayesian hierarchical models using Markov Chain Monte Carlo (MCMC) simulation = Installation instructions = `rjags` needs a working JAGS installation. The following instructions will build and install JAGS 4.3.2 to `$JAGS_HOME` on bwUniCluster 3.0. First, in order to compile them on a compute node,..."

2025-07-15T08:20:11Z

Created page with "= General information = rjags is an R interface to use JAGS, [https://mcmc-jags.sourceforge.io/ Just another Gibbs Sampler], a program for analysis of Bayesian hierarchical models using Markov Chain Monte Carlo (MCMC) simulation = Installation instructions = <code>rjags</code> needs a working JAGS installation. The following instructions will build and install JAGS 4.3.2 to <code>$JAGS_HOME</code> on bwUniCluster 3.0. First, in order to compile them on a compute node,..."

New page

= General information =

rjags is an R interface to use JAGS, [https://mcmc-jags.sourceforge.io/ Just another Gibbs Sampler], a program for analysis of Bayesian hierarchical models using Markov Chain Monte Carlo (MCMC) simulation

= Installation instructions =
<code>rjags</code> needs a working JAGS installation. The following instructions will build and install JAGS 4.3.2 to <code>$JAGS_HOME</code> on bwUniCluster 3.0.

First, in order to compile them on a compute node, we obtain an interactive session:
<pre>
# Obtain interactive batch session
salloc -p dev_cpu -N1 --ntasks-per-node 4 -t 30 --mem=4096
</pre>

== Install external dependencies ==
Then we download and compile JAGS using GCC 11.4:
<pre>
# Load required modules.
module purge
module load math/R

# Set up JAGS installation directory.
export JAGS_HOME="$HOME/sw/jags"

# Set up source directory.
mkdir -p ~/src
cd ~/src

# Download JAGS source.
wget https://sourceforge.net/projects/mcmc-jags/files/JAGS/4.x/Source/JAGS-4.3.2.tar.gz
tar -xf JAGS-4.3.2.tar.gz
rm JAGS-4.3.2.tar.gz
cd JAGS-4.3.2

# Compile JAGS.
export CFLAGS="-O3 -fPIC -malign-data=cacheline -finline-functions -m64 -Wno-implicit-function-declaration"
export CXXFLAGS="-O3 -fPIC -malign-data=cacheline -finline-functions -m64 -std=c++23 -Wno-implicit-function-declaration"

./configure --prefix="$JAGS_HOME" --with-blas="-lopenblas"
make -j 4
make install
</pre>

== Install <code>rjags</code> in R ==

=== Preparations ===
Prepare an <code>.R/Makevars</code> file (if it does not already exist). This file specifies how R should compile the packages (i.e., sets some 'compiler flags').

If an <code>.R/Makevars</code> file is present in your home directory (<code>$HOME</code>), check whether the flags displayed below are already set and apply adjustments, if necessary:
<pre>
cat $HOME/.R/Makevars

CXX14=g++
CXX17=g++
CFLAGS+=-O3 -fPIC -malign-data=cacheline -finline-functions -m64 -Wno-implicit-function-declaration
CXXFLAGS+=-O3 -fPIC -malign-data=cacheline -finline-functions -m64 -Wno-implicit-function-declaration
CXX14FLAGS += -std=c++14
CXX17FLAGS += -std=c++17 -fPIC
</pre>

Please run the following lines of code to set the flags, if necessary:
<pre>
mkdir -p ~/.R

echo "CXX14=g++" > $HOME/.R/Makevars
echo "CXX17=g++" >> $HOME/.R/Makevars
echo "CFLAGS+=-O3 -fPIC -malign-data=cacheline -finline-functions -m64 -Wno-implicit-function-declaration" >> $HOME/.R/Makevars
echo "CXXFLAGS+=-O3 -fPIC -malign-data=cacheline -finline-functions -m64 -Wno-implicit-function-declaration" >> $HOME/.R/Makevars
echo "CXX14FLAGS += -std=c++14" >> $HOME/.R/Makevars
echo "CXX17FLAGS += -std=c++17 -fPIC" >> $HOME/.R/Makevars
</pre>

=== Install <code>rjags</code> package ===

<pre>
# Set up environment and install JAGS within R session.
export PKG_CONFIG_PATH=$JAGS_HOME/lib/pkgconfig
export LD_RUN_PATH=$JAGS_HOME/lib

R -q
> install.packages("rjags", configure.args="--enable-rpath")
> library(rjags)
</pre>

= Use <code>rjags</code>=
<pre>
# Set up environment
export JAGS_HOME="$HOME/sw/jags"
export PATH=$JAGS_HOME/bin:$PATH
export PKG_CONFIG_PATH=$JAGS_HOME/lib/pkgconfig
export LD_RUN_PATH=$JAGS_HOME/lib

R -q
> library(rjags)
</pre>

BwUniCluster3.0/Software/R/Rjags - Revision history