tight yaxis for a given x-range

[OT]

Hi;
I plot data, everything is fine; then I want to rescale the plot on a small
x-axis (line 2 below).
I would like to restrict the y-axis, tightly to the data in the x-range.
>From previous posts, I guess
this is possible (see link below), but I did not manage to do it.

plot(1:100,cos((1:100)/10));         %%%% just plotting
axis([27,38]);                                %%%% restricting the x-axis;
it works, but the y-axis is way too large
axis("tight",[27,38]);                      %%%% trying to make the y-axis
tight; not ok
ylim("auto");                                  %%%% trying again; not ok
ylim("tight");                                  %%%% trying again; not ok

Any help appreciated, have a great day :-)

(the following thread is very related but too old for posting:
http://octave.1599824.n4.nabble.com/axis-tight-only-for-specific-axes-td2330430.html
)

===================
octave:10> version
ans = 3.8.1
octave:11> graphics_toolkit 
ans = gnuplot

uname -a
 3.13.0-62-generic #102-Ubuntu SMP Tue Aug 11 14:29:36 UTC 2015 x86_64
x86_64 x86_64 GNU/Linux




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