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### ggplot MCMC posteriors and priors by scenario, parameter and replicas ###
### Author : Facundo Muñoz (facundo.munoz@orleans.inra.fr)
### Licence: GPL-3
### Date   : 2014-09-10


### Required packages
library(rlist)    # data-manipulation
library(plyr)
library(reshape2)

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# This procedure allows to plot blocks borders
# over some spatially-arranged variable

# Data is assumed to be on a regular grid
# The dataset contains row and column coordinates
# a numerical variable indicating the block number of the current cell
# and the numerical variable to be plotted

# Requirements:
# either package rgeos, which depends on [GEOS](http://trac.osgeo.org/geos/) (GEometry Open Source)

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library(ggplot2)

# Some fake points
N <- 500
loc <- matrix(runif(2*N), ncol=2)

# A regular (not necessarily square) grid
n.row <- 10
n.col <- 10
xrange <- range(loc[,1])