I wish — unfortunately, SageMath doesn’t actually include Octave. I tried to include Octave at one point, but it took far too long to build from source and replicated too much functionality already available in Numpy/Scipy to make it worth the work at the time. I did write a (maybe not so great) pexpect interface between Sage and Octave, and there is also a Jupyter kernel that lets you call Octave from Python. Similar remarks apply to SciLab. A big point of Sage after all is getting open source math software to work together rather than compete. We are all on the same team!
