help on calculating sum of combinations

[sanjiv kapur]

hello
i am a newbie for using octave (on rh9.0) ,though used a little matlab 
before.may i request help in solving the problem as under,in case a function 
has been developed by somebody.
from a matrix or an array,i want to calculate the sum of various 
combinations, i.e
if A=[2, 3, 4,5]
how do i get
        a1=2+3+4+5
        a2=2*3+2*4+2*5
        a3=2*3*4+2*3*5+2*4*5+3*4*5
        a4=2*3*4*5
please guide me.
thanks and regards
sanjiv

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