Update README.md

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@ -18,6 +18,35 @@ numpy.ravel_multi_index(multi_index, dims, mode='raise', order='C')
> Converts a tuple of index arrays into an array of flat indices, applying boundary modes to the multi-index.
```python
import numpy as np
idx = np.ravel_multi_index(([0, 1, 2], [0, 1, 1]), dims=(3, 2))
print(idx) # -> [0 3 5]
a = np.zeros((3, 2))
a.flat[idx] = 1
print(a)
print()
a = np.zeros((3, 2))
a.flat[idx] = np.arange(1, idx.shape[0] + 1)
print(a)
```
Output:
```python
[[1. 0.]
[0. 1.]
[0. 1.]]
[[1. 0.]
[0. 2.]
[0. 3.]]
```
## [numpy.unravel_index](https://numpy.org/doc/stable/reference/generated/numpy.unravel_index.html)
```python