4 4 1 0 1 -1 1 -1 0 6 1 0 -1 7 1 1 0 -2

This is a matrix for the following inequalities:

1 = inequality, 0x + 1y -1 >=0 --> y >= 1 1 = inequality, -1x + 0y +6 >=0 --> x <= 6 1 = inequality, 0x + -1y +7 >=0 --> y <= 7 1 = inequality, 1x + 0y -2 >=0 --> x >= 2

Notice that if the first number was a 0 instead of a 1, then that constraint would be an equality instead of an inequality.

Sorin Olaru 2002-04-24