# 饲料配方计算器

## 说明

一个饲料配方计算脚本, 通过线性规划计算价格最优饲料配方。

## 使用

将脚本内的 **<u>原料营养数据(ingredients) / 猪需求营养数据(requirements) / 市面配方(market_formula)</u>** 替换成真实的数据,
运行脚本即可

输出包括 [results](./results) 目录下的四个文件和中断直接输出的结果(内容基本相同), 终端输出结果类似如下:

```
C:\Users\xxx\python.exe C:\Users\xxx\feed_formula_calculator.py 
Welcome to the CBC MILP Solver 
Version: 2.10.3 
Build Date: Dec 15 2019 

command line - C:\Users\xxx/cbc.exe C:\Users\xxx\16f9f76a01ab4426ba80de86c285ecdb-pulp.mps -primalT -1e-12 -dualT -1e-12 -maxIt -10000000 -presolve -on -strategy -2 -randomC -123 -sec -10 -timeMode elapsed -branch -printingOptions all -solution C:\Users\xxx\16f9f76a01ab4426ba80de86c285ecdb-pulp.sol
At line 2 NAME          MODEL
At line 3 ROWS
At line 14 COLUMNS
At line 120 RHS
At line 130 BOUNDS
At line 146 ENDATA
Problem MODEL has 9 rows, 15 columns and 90 elements
Coin0008I MODEL read with 0 errors
-1e-12 was provided for primalTolerance - valid range is 1e-20 to 1.79769e+308
-1e-12 was provided for dualTolerance - valid range is 1e-20 to 1.79769e+308
-10000000 was provided for maxIterations - valid range is 0 to 2147483647
presolve has value on
No match for on - ? for list of commands
-2 was provided for strategy - valid range is 0 to 2
-123 was provided for randomCbcSeed - valid range is -1 to 2147483647
-10 was provided for seconds - valid range is -1 to 1.79769e+308
Option for timeMode changed from cpu to elapsed
Presolve 9 (0) rows, 15 (0) columns and 90 (0) elements
0  Obj 0 Primal inf 3.1648143 (7)
9  Obj 2054.9281
Optimal - objective value 2054.9281
Optimal objective 2054.928067 - 9 iterations time 0.002
Option for printingOptions changed from normal to all
Total time (CPU seconds):       0.00   (Wallclock seconds):       0.00


=== 优化配方结果 ===
+-------------+----------+------------+
| 原料          |   比例 (%) |   成本 (元/吨) |
+=============+==========+============+
| 构树叶_未加工     |     0.00 |       0.00 |
+-------------+----------+------------+
| 构树叶_发酵      |     0.00 |       0.00 |
+-------------+----------+------------+
| 玉米胚芽_压榨     |    73.58 |    1250.87 |
+-------------+----------+------------+
| 麦麸          |     0.00 |       0.00 |
+-------------+----------+------------+
| 米糠          |     0.00 |       0.00 |
+-------------+----------+------------+
| 牧草_苜蓿干      |     0.00 |       0.00 |
+-------------+----------+------------+
| 玉米          |     8.10 |     191.80 |
+-------------+----------+------------+
| 豆粕          |    15.79 |     521.05 |
+-------------+----------+------------+
| 植物油_豆油      |     0.00 |       0.00 |
+-------------+----------+------------+
| 赖氨酸_L盐      |     0.00 |       0.00 |
+-------------+----------+------------+
| 蛋氨酸_DL      |     0.00 |       0.00 |
+-------------+----------+------------+
| 预混料_维生素微量元素 |     0.00 |       0.00 |
+-------------+----------+------------+
| 鱼粉          |     1.52 |      76.15 |
+-------------+----------+------------+
| 骨粉          |     1.00 |      15.06 |
+-------------+----------+------------+
| 食盐          |     0.00 |       0.00 |
+-------------+----------+------------+
总价格: 2054.93 元/吨
一斤饲料价格: 1.03 元

=== 营养总量与需求偏差 ===
+------+-------+-------+--------+------+-----------+------+
| 营养   |   实际值 |   需求值 | 需求类型   |   偏差 |   偏差比例(%) | 状态   |
+======+=======+=======+========+======+===========+======+
| 蛋氨酸  |  0.28 |  0.25 | 下限     | 0.03 |     12.00 | 达标   |
+------+-------+-------+--------+------+-----------+------+
| 能量   | 12.50 | 12.50 | 下限     | 0.00 |      0.00 | 达标   |
+------+-------+-------+--------+------+-----------+------+
| 赖氨酸  |  0.81 |  0.80 | 下限     | 0.01 |      1.25 | 达标   |
+------+-------+-------+--------+------+-----------+------+
| 钙    |  0.50 |  0.50 | 下限     | 0.00 |      0.00 | 达标   |
+------+-------+-------+--------+------+-----------+------+
| 磷    |  0.55 |  0.40 | 下限     | 0.15 |     37.50 | 达标   |
+------+-------+-------+--------+------+-----------+------+
| 蛋白   | 17.00 | 17.00 | 下限     | 0.00 |      0.00 | 达标   |
+------+-------+-------+--------+------+-----------+------+
| 纤维   |  6.00 |  6.00 | 上限     | 0.00 |      0.00 | 达标   |
+------+-------+-------+--------+------+-----------+------+
| 单宁   |  0.00 |  0.50 | 上限     | 0.50 |    100.00 | 达标   |
+------+-------+-------+--------+------+-----------+------+

=== 市面配方营养总量 ===
+------+-------+
| 营养   |     值 |
+======+=======+
| 蛋氨酸  |  0.31 |
+------+-------+
| 能量   | 11.56 |
+------+-------+
| 赖氨酸  |  0.86 |
+------+-------+
| 钙    |  0.82 |
+------+-------+
| 磷    |  0.82 |
+------+-------+
| 蛋白   | 17.76 |
+------+-------+
| 纤维   |  3.70 |
+------+-------+
| 单宁   |  0.00 |
+------+-------+

=== 市面配方成本与偏差 ===
+------------+---------+---------+--------+
| 项          |    市面配方 |    优化配方 |     偏差 |
+============+=========+=========+========+
| 总价格 (元/吨)  | 2385.53 | 2054.93 | 330.60 |
+------------+---------+---------+--------+
| 一斤饲料价格 (元) |    1.19 |    1.03 |   0.16 |
+------------+---------+---------+--------+

所有结果已存至 results/ 文件夹

进程已结束，退出代码为 0
```