average of a function

[Fred J.]

Hello

debian 2.6.8 i686-pc-GNU/Linux
GNU Octave, version 2.1.60

I just started with octave, and appreciate some help
with this simple 
task, could not get much help from reading the FAQs
and the manual.

OK, 
I need to determine the average value of this function
which I expect
it to be -1.620993 but I am getting a different ans
and not sure if I am
using octave correctly.

octave> function y=x(t), y = t^2 - 5*t + 6*cos(pi*t);
end;
octave> quad('x', -1, 5/2)
ans = -5.6735


Thanks


                
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