LinearProgramming::lprank2
DualLinearProgramming::lprank2
An error occurs because the second argument is not a matrix:
LinearProgramming[{2, -3}, {{1}, {0, -1}}, {3, -1}]This shows valid input in LinearProgramming:
LinearProgramming[{2, -3}, {{1, 0}, {0, -1}}, {3, -1}]