eigs.m problem in Octave 3.2.2

[david]

Hi,

I installed Octave 3.2.2, when I do: help eigs, I can see its help information 
as below, but when I use it, it shows:

octave:16> a=[1 2 3;4 5 6;7 8 9];
octave:17> eigs(a)
error: eigs: not available in this version of Octave


octave:15> help eigs
`eigs' is a function from the file 
/usr/local/libexec/octave/3.2.2/oct/i686-pc-linux-gnu/e
igs.oct

 -- Loadable Function: D = eigs (A)
 -- Loadable Function: D = eigs (A, K)
 -- Loadable Function: D = eigs (A, K, SIGMA)
 -- Loadable Function: D = eigs (A, K, SIGMA,OPTS)
......


Does anyone know what is the problem? Is Octave 3.2.2 already built with ARPACK 
package?

Thanks a lot.