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Similar to above, the following worked for me from the notebook interface of sage:
os.environ["PATH"]+=":/opt/local/bin"
Octave was installed on my system using MacPorts.
I found that octave.eval('2+2') worked immediately in the notebook, but octave(2+2), required:
octave = Octave()
octave._start()
otherwise it errored with "ValueError: The octave session in which this object was defined is no longer running."
Note: octave.eval returns a string, usually with "ans =", whereas octave() returns a number that I could perform further operations on.
You may want to put octave.quit(True) at the end. I don't understand what is actually going on well, so take my advice with caution.
see also: http://www.sagemath.org/doc/reference/interfaces/sage/interfaces/octave.html
