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Least Cost Formulation with Python

Project description

plend

License Python package

Plend is a library for performing least cost formulation with Python. Plend uses PuLP to solve formula constraint problems.

Installation

$ pip install git+https://github.com/bherbruck/plend

or

$ pip install plend

Examples

from plend import Formula, Ingredient, Nutrient
from plend.presets.poultry import *

# initialize formula
starter = Formula(name='Starter', batch_size=100)

# add ingredient constraints from poultry presets
starter.add_ingredient(corn, minimum=1)
starter.add_ingredient(soybean_meal)
starter.add_ingredient(oil, maximum=5)
starter.add_ingredient(limestone)
starter.add_ingredient(meat_meal, maximum=10)

# add nutrient constraints from poultry presets
starter.add_nutrient(energy, minimum=3000)
starter.add_nutrient(protein, minimum=20)
starter.add_nutrient(fiber)
starter.add_nutrient(calcium, minimum=4, maximum=5)

# optimize the formula
starter.optimize()

# output the formula to a csv
print(starter.to_csv())

outputs:

library_name formula_name formula_code formula_cost formula_status item_type item_name item_code item_amount item_minimum item_maximum
default Starter 67.16379819 Optimal ingredient Corn 54.882934 1
default Starter 67.16379819 Optimal ingredient Soybean Meal 22.674542 0
default Starter 67.16379819 Optimal ingredient Oil 4.1552541 0 5
default Starter 67.16379819 Optimal ingredient Limestone 8.2872701 0
default Starter 67.16379819 Optimal ingredient Meat Meal 10.0 0 10
default Starter 67.16379819 Optimal nutrient Energy 3000.0000038 3000
default Starter 67.16379819 Optimal nutrient Protein 20.00000021 20
default Starter 67.16379819 Optimal nutrient Fiber 2.05230961 0
default Starter 67.16379819 Optimal nutrient Calcium 4.0000000154 4 5

Project details


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