infinite geometric series

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Hello ! 
 
I'm trying to implement infinite geometric series in octave but i don't know
if I'm doing it correctly.

function y=myfun(x)
 an=0; 
 n=0;
 s=1;
 while abs(an)< 0.3
 n=n+1;
 an=(-3*x).^n;
 s=s+an;
 end%while
 endfunction

Also I don't know how to read in x-values as a vector to this function and
get y-values as a vector.

All helpful ideas great to see. 




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