How Do I Change The Bounds Of A Lpvariable In Pulp Dynamically?

I've initialised my LpVariable like so: x = LpVariable('x', None, None) At this point, my variable has upper and lower bounds as float('inf') and float('-inf'). Now based on som

Solution 1:

Turns out both ways work. So for the example:

y = LpProblem("min", LpMinimize)
y += x +10  # Objective Function
x = LpVariable('x', None, None)  # setto bounds=[float("-inf"),float("inf")]

We can change the lower bound on x from the default float("-inf") to 20 in one of the following ways:

Option 1: Modifying the constraints on the LpProblem. So, for instance, if you wanted to change the lowBound of x to 20, you would need to use:

y += x > 20, "changing lower bound of x"

Option 2: Modifying the lowBound attribute on the LpVariable object:

x.lowBound = 20

Both these changes should give us the solution of y = 30