1 | initial version |
The process for implementing Linear Programming (LP) logic using PULP can be broken down into the following steps:
Import the required libraries: Firstly, import the required libraries such as PULP and Pandas.
Create the LP problem: Create a problem instance using the LpProblem function of PULP. The objective function and constraints can be added to this problem instance.
Define the decision variables: Define the decision variables using the LpVariable function. These variables should be added to the problem instance.
Define the objective function: Define the objective function using the lpSum function. This function should include the decision variables and their respective coefficients.
Add the constraints: Add constraints to the problem instance using the += operator. The constraints should be written as inequalities, with the variables and their coefficients.
Solve the LP problem: Call the solve() function on the problem instance to solve the LP problem.
Print the results: Print the results of the LP problem, including the optimal objective value and the values of the decision variables.
Example code for implementing LP logic using PULP:
import pulp as lp
import pandas as pd
# Define the LP problem instance
prob = lp.LpProblem("LP Problem", lp.LpMaximize)
# Define the decision variables
x = lp.LpVariable('x', lowBound=0, cat='Continuous')
y = lp.LpVariable('y', lowBound=0, cat='Continuous')
# Define the objective function
prob += lp.lpSum([3*x + 5*y])
# Add the constraints
prob += lp.lpSum([2*x + y]) <= 100
prob += lp.lpSum([x + 2*y]) <= 120
prob += lp.lpSum([x]) <= 60
prob += lp.lpSum([y]) <= 40
# Solve the LP problem
prob.solve()
# Print the results
print("Optimal Objective Value: ", lp.value(prob.objective))
print("Value of x: ", lp.value(x))
print("Value of y: ", lp.value(y))
This example code defines an LP problem instance with two decision variables 'x' and 'y', an objective function with coefficients of 3 and 5 for 'x' and 'y' respectively, and 4 constraints. The LP problem is then solved using PULP and the optimal objective value and values of the decision variables are printed.