scipy/scipy — pull request #2483 by argriffing (2013-05-11 18:14:57+00:00)
Title: MAINT: hide the scipy.linalg.expm2 and expm3 functions

The expm2 and expm3 functions are not practical alternatives to expm except for testing, so I've made them harder to use accidentally, and reduced the amount of name space pollution. See the discussion here:
https://github.com/scipy/scipy/pull/2441#issuecomment-17557830