====== Installing sage on ubuntu ======

Sage is a very powerful computer algebra system. Especially nice is the LaTeX integration using sagetex. Here's how to set this up:

===== Compile yourself =====

Install prerequisite libraries
  sudo apt-get install build-essential m4 readline-common libreadline-dev texlive xpdf evince tk8.5-dev gfortran

Download the current version of the sources and compile them
  wget http://mirror.switch.ch/mirror/sagemath/src/sage-4.8.tar
  tar xvf sage-4.8.tar
 
===== Download pre-build =====

Download the file for you platform from here http://www.sagemath.org/download-linux.html

Unpack/move the build or downloaded files to /opt, this gives you a directory /opt/sage-4.xy...

===== Finishing up the installation =====

Make a symolic link to this directory:
  sudo ln -s /opt/sage-4.... /opt/sage

Change the ownership of the files to root
  sudo chown root:root /opt/sage/* -R
  
Run sage as root for the first time to update some paths which are absolute
  cd /opt/sage-4....
  sudo sage
  
After that, you should be able to run sage as a normal user
  sage
  sage: 2+2
  4
  sage:
  
If you get errors when starting up, then probably the first start as root has created some files in the directory ~./sage which now belong to root instead of you (USER)
<code>
cd .sage 
sudo chown $USER:$USER * -R
sage
</code>
Should now work.

=====
 Setting up sagetex for LaTeX =====

If you use LaTeX and want to integrate sage into your latex files (which gives you all the power of sage/maxima/maple/... directly inside you LaTeX file!):
<code>
  mkdir ~/texmf
  ln -s /opt/sage/local/share/texmf/tex/generic/sagetex/ ~/textmf/sagetex
  sudo texhash
</code>

Now you have the sagetex.sty file from the sage installation available. If you run texlive, it's a good idea to hunt down and rename the outdated sagetex.sty file which probably hangs around:
  cd /usr/share/texmf-texlive/tex/latex/sagetex
  ls
  sudo mv sagetex.sty sagetex.sty.off
  sudo texhash
  
To get started with sagetex read this guide: http://www.sagemath.org/doc/tutorial/sagetex.html
  


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