bch441-work-abc-units/BIN-PHYLO-Tree_building.R

# BIN-PHYLO-Tree_building.R
#
# Purpose:  A Bioinformatics Course:
#              R code accompanying the BIN-PHYLO-Tree_building unit.
#
# Version:  1.0
#
# Date:     2017  10.  31
# Author:   Boris Steipe (boris.steipe@utoronto.ca)
#
# Versions:
#           1.0    First 2017 version
#           0.1    First code copied from 2016 material.
#
#
# TODO:
#           Add MrBayes
# https://cran.r-project.org/web/packages/phangorn/vignettes/IntertwiningTreesAndNetworks.html
#
# == DO NOT SIMPLY  source()  THIS FILE! =======================================
#
# If there are portions you don't understand, use R's help system, Google for an
# answer, or ask your instructor. Don't continue if you don't understand what's
# going on. That's not how it works ...
#
# ==============================================================================


#TOC> ==========================================================================
#TOC>
#TOC>   Section  Title                                   Line
#TOC> -------------------------------------------------------
#TOC>   1        Calculating Trees                         43
#TOC>   1.1      PROMLPATH ...                             64
#TOC>   1.1.1    ... on the Mac                            69
#TOC>   1.1.2    ... on Windows                            80
#TOC>   1.1.3    ... on Linux                              94
#TOC>   1.1.4    Confirming PROMLPATH                      99
#TOC>   1.2      Building a maximum likelihood tree       108
#TOC>
#TOC> ==========================================================================


# =    1  Calculating Trees  ===================================================


# Follow the instructions found at phylip's home on the Web to install. If you
# are on a Windows computer, take note of the installation directory.

# After you have installed Phylip on your computer, install the R package that
# provides an interface to the Phylip functions.

if (!require(Rphylip, quietly=TRUE)) {
  install.packages("Rphylip")
  library(Rphylip)
}
# Package information:
#  library(help = Rphylip)       # basic information
#  browseVignettes("Rphylip")    # available vignettes
#  data(package = "Rphylip")     # available datasets

# This will install RPhylip, as well as its dependency, the package "ape".


# ==   1.1  PROMLPATH ...  =====================================================
# The next part may be tricky. You will need to figure out where
# on your computer Phylip has been installed and define the path
# to the proml program that calculates a maximum-likelihood tree.

# ===  1.1.1  ... on the Mac
# On the Mac, the standard installation places a phylip folder
# in the /Applications directory. That folder contains all the
# individual phylip programs as <name>.app files. These are not
# the actual executables, but "app" files are actually directories
# that contain the required resources for a program to run.

# The executable is in a subdirectory and you can point Rphylip
# directly to that subdirectory to find the program it needs:
# PROMLPATH <- "/Applications/phylip-3.695/exe/proml.app/Contents/MacOS"

# ===  1.1.2  ... on Windows
# On Windows you need to know where the programs have been installed, and you
# need to specify a path that is correct for the Windows OS. Find the folder
# that is named "exe", and right-click to inspect its properties. The path
# should be listed among them.

# If the path looks like "C:\Users\Meng\Programs\phylip-3.695\exe", then your
# assignment has to be
# PROMLPATH <- "C:/Users/Meng/Programs/phylip-3.695/exe"
# (Note: "/", not "\")

# I have heard that your path must not contain spaces, and it is prudent to
# avoid other special characters as well.

# ===  1.1.3  ... on Linux
# If you are running Linux I trust you know what to do. It's probably
# something like
# PROMLPATH <- "/usr/local/phylip-3.695/bin"

# ===  1.1.4  Confirming PROMLPATH
# Confirm that the settings are right.
PROMLPATH                # returns the path
list.dirs(PROMLPATH)     # returns the directories in that path
list.files(PROMLPATH)    # lists the files [1] "proml"   "proml.command"

# If "proml" is NOT among the files that the last command returns, you
# can't continue. Ask on the mailing list for advice.

# ==   1.2  Building a maximum likelihood tree  ================================
# Now read the mfa file you have saved in the BIB-PHYLO-Data_preparation unit,
# as a "proseq" object with the read.protein() function of the RPhylip package:

apsIn <- read.protein("APSESphyloSet.mfa")

# ... and you are ready to build a tree.

# There are many fast options in PHYLIP - we will use the most _accurate_ one
# that it has: proml, a maximum-likelihood tree building program for protein
# data.

# Building maximum-likelihood trees can eat as much computer time
# as you can throw at it. Calculating a tree of 48 APSES domains
# with default parameters of Rproml() runs for more than half a day
# on my computer. But we have only twelve sequences here, so the
# process will take us about 5 to 10 minutes. Run this, and anjoy a good cup
# of coffee while you are waiting.

apsTree <- Rproml(apsIn, path=PROMLPATH)

# A quick first look:

plot(apsTree)

# save your tree:
save(apsTree, file = "APSEStreeRproml.RData")

# If this did not work, ask for advice.




# [END]