# eigs (The Python Package)
Find Eigenvalues and Eigenvectors efficiently in Python using UMFPACK + ARPACK (powered
by Rust).
## Example
```python
import numpy as np
from scipy.sparse import csc_matrix
from eigs import eigs
data = np.array([ 0.+4.j, 2.+3.j, 4.+0.j, 0.-2.j, -3.+3.j, 0.-1.j,
-3.-3.j, 4.-4.j, -4.+0.j, 4.+1.j, -4.-1.j, 4.+2.j,
3.+2.j, 0.+2.j, -4.+0.j, -4.+1.j, -4.+2.j, -2.+2.j,
-1.-2.j, 0.+3.j, -3.+0.j, 4.+0.j, -1.+3.j]) # fmt: skip
indices = np.array([6, 1, 4, 5, 7, 2, 3, 4, 5, 6, 7, 1,
1, 3, 3, 4, 0, 2, 5, 6, 3, 6, 7]) # fmt: skip
indptr = np.array([0, 1, 5, 11, 12, 14, 16, 20, 23])
A = csc_matrix((data, indices, indptr))
vals, vecs = eigs(A=A, num_eigs=4, sigma=-2.0 + 7.0j)
for i, val in enumerate(vals):
print(f"{i}: {val.real} + {val.imag}j")
```
```
0: -2.3310185657008846 + 7.624960781252993j
1: -4.525347075933688 + 1.8131068538310453j
2: 5.301183172745191 + 4.2055904210543575j
3: 0.1713950830265607 + 0.46316839127801934j
```
Find more examples in the [examples](./examples) folder.
## Installation
> Eigs is currently **linux-only** (x86_64) and **python 3.9+**.
> More platforms might be supported at a later point in time.
```bash
pip install eigs
```
## License & Credits
© Floris Laporte 2023, LGPL-2.1
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