different colours for different curves in the same plot

[Federica]

Hi,

I'm trying to represent several curves on the same plot using Octave 3.2.4
on Windows. The commands I used to have the unique plot and a relative
legend are:

hold on;
   s=sprintf(";Lu= %d;",LU);
plot(t,m,s);

hold off

where m is the result of a differential equation systems. So I have
different curves for different m but using these commands I have only a
colour for all the curves. Also if I specify the color I have only the
specific color I chose and I have it for all the curves. How can I tell to
Octave to pick a different color for each curve? 

Thank you so much!!!!

Federica

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