Revised Simplex Method - Demo code  REVISEDSIMPLEX This class implements revised Simplex Method to solve a linear programming problem in the following format   min/max c'x   s.t.   Ax {>=, =, <=} b   x >= 0      This class is designed for class demonstration and small problems only, neither suitable for large problem nor for high performance.  7 October 2013 Yiming Yan