Question about conv

[Walter White]

Hello,

I have a question about conv():

The documentation at http://octave.sourceforge.net/octave/function/conv.html says,
that it is possible to use the parameter "shape" to cut the result of the convolution
down to the original vector.

But this does not work for me. 

conv(random_scatter,gaussian,"same")

error: Invalid call to conv.  Correct usage is:

 -- Function File:  conv (A, B)


I had a look into conv.m and it does not seem to accept
that parameter at all. I am using version 3.2.4.
Has "shape" been implemented recently and 3.2.4 is too old?

Kind regards,
Walter