scipy.spatial.distance.

num_obs_y#

scipy.spatial.distance.num_obs_y(Y)[source]#

Return the number of original observations that correspond to a condensed distance matrix.

Parameters:

Yarray_like: Condensed distance matrix.

Returns:

nint: The number of observations in the condensed distance matrix Y.

Notes

Array API Standard Support

num_obs_y has support for Python Array API Standard compatible backends in addition to NumPy. The following combinations of backend and device (or other capability) are supported.

Library	CPU	GPU
NumPy	✅	n/a
CuPy	n/a	✅
PyTorch	✅	✅
JAX	✅	✅
Dask	✅	n/a

See Support for the array API standard for more information.

Examples

Find the number of original observations corresponding to a condensed distance matrix Y.

>>> from scipy.spatial.distance import num_obs_y
>>> Y = [1, 2, 3.5, 7, 10, 4]
>>> num_obs_y(Y)
4