---
title: "FROGS Phyloseq: Beta Diversity Visualisation (version 4.0.1)"
output: 
  html_notebook:
    code_folding: hide
params:
   phyloseq:
      value: x
   varExp:
      value: x
   methods:
      value: x
   libdir:
      value: x
---
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```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, error = TRUE)
```
Phyloseq `r packageVersion("phyloseq")`

```{r import, message=FALSE}
## Import packages
library(phyloseq)
library(ggplot2)
library(gridExtra)
library(reshape2)
source(file.path(params$libdir, "graphical_methods.R"))
## Alternative to source all extra function from a github repo
## source("https://raw.githubusercontent.com/mahendra-mariadassou/phyloseq-extended/master/load-extra-functions.R")

## Setting variables
  ## The Phyloseq object (format rdata)
  # phyloseq <- ""

  ## The experiment variable that you want to analyse
  # varExp <- ""

  ## The methods of beta diversity you want to compute
  ## to see all available distance methods, type distanceMethodList
  ## The most common one are : cc for Jaccard, bray for Bray-Curtis, unifrac and wunifrac for Unifrac and weighted Unifrac
  ## N.B. if the tree is not available in your RData, you cannot choose Unifrac or Weighted Unifrac
  ## You may precise multiple distance by separating them by a comma
  # methods <- ""

## Create input and parameters dataframe
  # params <- data.frame( "phyloseq" = phylose, "varExp" = varExp, "methods" = methods)

## Load data
  ## the phyloseq object
load(params$phyloseq) 

## store methods in list
methods <- as.list(strsplit(params$methods, ",")[[1]])

## Order samples according to grouping variable
sampleOrder <- levels(reorder(sample_names(data), as.numeric(get_variable(data, params$varExp)))) 
```

### Distance as heatmap plot(s)
```{r, fig.width=8, fig.height=6, warning=FALSE}

for (method in methods){
  dist.a <- distance(data, method = method)
  a <- as.matrix(dist.a)
  write.table(a, paste(sep="", method, ".tsv"), sep="\t", quote=FALSE, col.names=NA)
  pa <- plot_dist_as_heatmap(dist.a, order = sampleOrder, title = paste("Heatmap plot of the beta distance :",method)) + 
    theme(plot.title = element_text(hjust = 0.5))
  plot(pa)
}
```
