specgram: squeezed time plot

[dariodematties]

Hello, I need to use specgram tool from signal package.
My installation in Ubuntu 14.04 is:
GNU Octave Version 3.8.1
GNU Octave License: GNU General Public License
Operating System: Linux 4.4.0-59-generic #80~14.04.1-Ubuntu SMP Fri Jan 6
18:02:02 UTC 2017 x86_64
----------------------------------------------------------------------
Package Name  | Version | Installation directory
--------------+---------+-----------------------
       audio *|   1.1.4 | /usr/share/octave/packages/audio-1.1.4
     control *|   2.6.2 | /usr/share/octave/packages/control-2.6.2
     general *|   1.3.4 | /usr/share/octave/packages/general-1.3.4
          io  |   2.4.5 | /home/dario/octave/io-2.4.5
       ltfat  |   2.1.2 | /home/dario/octave/ltfat-2.1.2
     mapping *|   1.0.7 | /usr/share/octave/packages/mapping-1.0.7
      signal *|   1.2.2 | /usr/share/octave/packages/signal-1.2.2
     specfun *|   1.1.0 | /usr/share/octave/packages/specfun-1.1.0
When I run some of the examples available in:
https://octave.sourceforge.io/signal/function/specgram.html,
I get a plot whose time dimension is cramped in a so tiny window in time,
that such plot cannot be visualized.
What could be the reason for this behavior?

Any help will be highly appreciated,

Thanks



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