gnu-octave/octave ? reverse-engineered prompt

Build me a GNU Octave style app for numerical computing, with an interactive command line and a simple GUI, so I can run math experiments, solve linear and nonlinear problems, make plots, and write scripts that feel close to Matlab. I want it to support basic array math, file based programs, and the kind of workflow where I can type commands, see results right away, and visualize data without a lot of setup.

Please make the project build cleanly from source, include the main runtime, interpreter, and whatever is needed for plotting and the GUI, and add a few example scripts plus basic tests so I can verify it works. If you need to check current build or dependency details, look up the latest docs online.