How to determine if you are in octave or matlab

[David Grohmann]

is there a function call or snippet of code that both octave and matlab 
will respond to that can be used to determine programatically if you are 
running under octave or matlab?

so something like this can be written:

if in_octave
   do_something();
else
   do_something_slightly_differently();
end

Thanks,

--
David Grohmann
Senior Student Associate
Applied Research Lab : UT Austin : ESL - S206
Office: 512-835-3237