Linprog: some lambda.lower > lambda.upper in output

In my output, some lambda.lower > lambda.upper.

According to Description of Output Lambda, lambda.lower and lambda.upper are like lb and ub, so lambda.lower < lambda.upper.

Why can I observe some lambda.lower > lambda.upper?

Answer 1

[Alan Weiss]

You are mistaken that lambda.lower relates to lambda.upper. These are Lagrange multipliers. If the solution is at a lower bound, lambda.upper = 0 and lambda.lower ~= 0. If the solution is at an upper bound, lambda.lower = 0 and lambda.upper ~= 0.

Alan Weiss

MATLAB mathematical toolbox documentation