On Sun, May 13, 2012 at 8:44 PM, Lkjnlkjn Lkjnlkjn
<address@hidden> wrote:
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=A^(−1)b such that all its entries are integers. While I'm primarily concerned with Octave, your answer may alternatively consider Wolfram|Alpha, or any other software available with a free online interface. If discussing Wolfram|Alpha or other systems, please also explain how to load a sparse matrix, which is currently in row, col, value format (i.e., I would prefer to do minimal format conversions).
If A is integers and its determinate is 1 then inv(A) will be integers.
Is that what you are looking for?