In Octave, how do I specify that the solution to a matrix equation should be over integers? [closed]

In Octave, how do I specify that the solution to a matrix equation should be over integers?

I.e., Given matrix $A$, vectors $x$ and $b$; $Ax=b$. Find vector $x$($=\frac{b}{A}$) such that all its entries are integers. While I'm primarily concerned with Octave, for completeness, your answer may also include Mathematica, etc.

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You should consider posting this question at scicomp.SE. –  becko May 13 '12 at 23:05