Help with plotting - major problem with

[drugistudent]

Hi! I'm from Poland and I study at Gdansk University of Technologi - Civil
Enginerring.
I've a problem with this task http://i49.tinypic.com/1z6d2xf.jpg - plot in
MATLAB all lines which are in the picture but I'm using an octave ;)
I've succesfully plotted straight lines but i've major problem with sinus
(or tanges,cosinus other function that must be from 0.2 to 0.3,0.01 to 0.06
etc)
I'm typing (in blank m-file) :

t=[1:0.1:9]
y=sin(t)
plot(y)


and octave plot this:

http://tinypic.com/r/4uc56t/6

why it's showing my field as t=[10:90]
this problem apper also in other function, and it's analogy eg. t=[1:0.01:9]
it shows t as from 100 to 900

i'm using octave (3.6.2) + xoctave + packages i installed during
installation

please help me ;)
thx in advance



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