Plot help, plot properties

[SITI HAJAR A BAKAR]

Hi all,
I am relatively new to using gnuplot on Octave and find both manuals 
confusing. 

Can someone explain why the first set of code, specifying only the 
legend works, but the second; specifying the line colour and legend 
doesn't??

uh=1:20; yh=2*uh;
plot(uh,yh,';True response;')

plot(uh,yh,'b',';True response;')

I'm also getting all kinds of set and unset errors in gnuplot window. 
Would appreciate the help. Thanks!

Regards, Hajar



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