Difference in the output of lsim()/impulse() between Octave and Matlab

[rocketsound]

I just noticed that the output generated by lsim()/impulse() heavily differ
between Octave and Matlab. An example (you can download it  here
<http://pastebin.com/GQFgRJGG>  , too):



For Matlab R2014a I get:



For Octave 3.8.2 (mxe-build, with control 2.6.5) I get:



Also, as you see in the plot that opens, the simulation results aren't
comparable.

lsim_Octave.png
<http://octave.1599824.n4.nabble.com/file/n4667588/lsim_Octave.png>  
lsim_Matlab.png
<http://octave.1599824.n4.nabble.com/file/n4667588/lsim_Matlab.png>  

So my question: Is this a bug or am I missing something? Since I'm porting a
lot of stuff from Matlab to Octave I'm really interessted in those details
and I'm thankful for some help.



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