plend
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 |
