octave4.0 already has a more perfect graphical GUI interface. In the source ubuntu14.04.3 does not contain octave4.0, you want to use source code must be compiled.
1, download the source code from 4.0 octave official website.
2, dependent libraries
sudo apt-get install build-essential gdb gfortran
sudo apt-get install autoconf automake libtool libreadline-dev libncurses5-dev
sudo apt-get install texinfo flex bison
sudo apt-get build-dep octave
sudo apt-get install libosmesa6 libosmesa6-dev
sudo apt-get install libqt4-core libqt4-dev libqt4-dev-bin libqt4-gui libqt4-opengl libqt4-opengl-dev
sudo apt-get install icontool icoutils
sudo apt-get install librsvg2-2 librsvg2-bin librsvg2-dev librsvg2-2.0-cil-dev librsvg2-common librsvg2-doc librsvg2-2.18-cil
3，在源码解压目录，运行
./configure
make
sudo make install
You can also run without installation, use ./run-octave start after compilation
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octave is still very good, very beautiful graphic chart display.
Scilab also be used to calculate the results of mutual authentication.
