# cvxpy one.

There's loads of usecases in logistics where you'd like to optimise a system while being subjected to constraints. In this series of videos we'd like to highlight a tool that can handle a subset of these problems called cvxpy.

**Episode Notes**

This is the new problem definition with constraints;

```
import cvxpy as cp
import pandas as pd
df = pd.read_csv("/path/to/stigler.csv")
price = df['price_cents'].values
x = cp.Variable(price.shape[0])
objective = cp.Minimize(cp.sum(price*x))
constraints = [
x >= 0,
cp.sum(df['vitamin_c_mg'].values * x) >= 75,
cp.sum(df['iron_mg'].values * x) >= 12,
cp.sum(df['vitamin_b1_mg'].values * x) >= 1.8,
cp.sum(df['vitamin_b2_mg'].values * x) >= 2.7,
]
prob = cp.Problem(objective, constraints)
prob.solve()
```

This is the pandas code at the bottom;

```
(df
.assign(assignment = x.value)
.sort_values(['assignment'], ascending=False)
.head(5))
```

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