octave-info 4.2.1-4build2 (amd64 binary) in ubuntu bionic

 Octave is a (mostly Matlab (R) compatible) high-level language, primarily
 intended for numerical computations. It provides a convenient command-line
 interface for solving linear and nonlinear problems numerically.
 .
 This package provides the following documentation in info format: a document
 on the C++ classes used by Octave, as well as the main octave documentation
 which is needed for the 'help -i foo' command within Octave.