Install Gurobi

Download:
- Visit https://www.gurobi.com/downloads/gurobi-optimizer
- Select 64-bit Linux Current version and download the compressed distribution file.
Extract the archive to /opt using the following command, changing the Gurobi version as appropriate:
```
sudo tar xvfz ~/Downloads/gurobi7.5.1_linux64.tar.gz -C /opt
```
After extraction, make note of where Gurobi was installed.
It should be something like /opt/gurobi701/linux64/.
We'll need this path in the steps below.

Update .bashrc to include Gurobi environment variables:

cd ~
pico .bashrc

Add the following lines at the end of .bashrc, changing the Gurobi path as appropriate:

export GUROBI_HOME="/opt/gurobi751/linux64"
export PATH="${PATH}:${GUROBI_HOME}/bin"
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${GUROBI_HOME}/lib"

Reload the .bashrc file:

source .bashrc

Obtain a free academic license:
- https://user.gurobi.com/download/licenses/free-academic
Activate your Gurobi license, replacing the x's below with your license key:
```
grbgetkey xxxxxxxxxxxxxxxxxxxxx
```
Create the gurobipy package, so we can import within Python.
- First, let's make sure we aren't in a Python virtual environment:
```
 deactivate
```
- Now, build the gurobipy package. Change the Gurobi path below as appropriate:
```
 cd /opt/gurobi751/linux64
 sudo python setup.py install
```
Test:
```
python
>>> import gurobipy
```
(optional) If you're using Python virtual environments...
- To use gurobipy within a virtual environment, we'll need to create a symbolic link to the gurobipy.so file.
- The code below assumes that (1) we have a Python 2.7 virtual environment named olab2 with a particular path, and (2) we have installed Gurobi 7.5.1 and have found the path to gurobipy.so. You may need to change these paths as appropriate for your setup.
```
 workon olab2
 cd ~/.virtualenvs/olab2/lib/python2.7/site-packages 
 ln -s /opt/gurobi751/linux64/lib/python2.7/gurobipy.so
```

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