`fast_array_utils.stats`¶

Statistics utilities for 2D arrays.

All of these allow you to specify an axis, which allows you to choose whether to compute the statistic across rows, columns, or all elements.

fast_array_utils.stats.is_constant(x: NDArray[Any] | types.CSBase | types.CupyArray, /, *, axis: None = None) → bool¶

fast_array_utils.stats.is_constant(x: NDArray[Any] | types.CSBase, /, *, axis: Literal[0, 1]) → NDArray[np.bool]

fast_array_utils.stats.is_constant(x: types.CupyArray, /, *, axis: Literal[0, 1]) → types.CupyArray

fast_array_utils.stats.is_constant(x: types.DaskArray, /, *, axis: Literal[0, 1, None] = None) → types.DaskArray

Check whether values in array are constant.

Parameters:

x – Array to check.
axis – Axis to reduce over.

Returns:

If axis is None, return if all values were constant. Else returns a boolean array with True representing constant columns/rows.

Example

>>> import numpy as np
>>> x = np.array([
...     [0, 1, 2],
...     [0, 0, 0],
... ])
>>> is_constant(x)
False
>>> is_constant(x, axis=0)
array([ True, False, False])
>>> is_constant(x, axis=1)
array([False,  True])

fast_array_utils.stats.mean(x: ndarray | csr_matrix | csc_matrix, /, *, axis: Literal[0, 1], dtype: DTypeLike | None = None) → types.CupyArray

fast_array_utils.stats.mean(x: types.DaskArray, /, *, axis: Literal[0, 1], dtype: ToDType[Any] | None = None) → types.DaskArray

Mean over both or one axis.

Parameters:

x – Array to calculate mean(s) for.
axis – Axis to reduce over.

Returns:

If axis is None, then the sum over all elements is returned as a scalar. Otherwise, the sum over the given axis is returned as a 1D array.

Example

>>> import numpy as np
>>> x = np.array([
...     [0, 1, 2],
...     [0, 0, 0],
... ])
>>> mean(x)
np.float64(0.5)
>>> mean(x, axis=0)
array([0. , 0.5, 1. ])
>>> mean(x, axis=1)
array([1., 0.])

See also

numpy.mean()

fast_array_utils.stats.mean_var(x: ndarray[tuple[int, ...], dtype[Any]] | csc_matrix | csr_matrix | csc_array | csr_array, /, *, axis: Literal[0, 1], correction: int = 0) → tuple[NDArray[np.float64], NDArray[np.float64]]

fast_array_utils.stats.mean_var(x: ndarray | csr_matrix | csc_matrix, /, *, axis: Literal[0, 1], correction: int = 0) → tuple[types.CupyArray, types.CupyArray]

fast_array_utils.stats.mean_var(x: types.DaskArray, /, *, axis: Literal[0, 1, None] = None, correction: int = 0) → tuple[types.DaskArray, types.DaskArray]

Mean and variance over both or one axis.

Parameters:

x – Array to compute mean and variance for.
axis – Axis to reduce over.
correction – Degrees of freedom correction.

Returns:

mean: See below:
var: If axis is None, the mean and variance over all elements are returned as scalars. Otherwise, the means and variances over the given axis are returned as 1D arrays.

Example

>>> import numpy as np
>>> x = np.array([
...     [0, 1, 2],
...     [0, 0, 0],
... ])
>>> mean_var(x)
(np.float64(0.5), np.float64(0.5833333333333334))
>>> mean_var(x, axis=0)
(array([0. , 0.5, 1. ]), array([0.  , 0.25, 1.  ]))
>>> mean_var(x, axis=1)
(array([1., 0.]), array([0.66666667, 0.        ]))

See also

numpy.mean(), numpy.var()

fast_array_utils.stats.sum(x: ndarray | csr_matrix | csc_matrix, /, *, axis: Literal[0, 1], dtype: DTypeLike | None = None) → types.CupyArray

fast_array_utils.stats.sum(x: types.DaskArray, /, *, axis: Literal[0, 1, None] = None, dtype: DTypeLike | None = None) → types.DaskArray

Sum over both or one axis.

Parameters:

x – Array to sum up.
axis – Axis to reduce over.

Returns:

If axis is None, then the sum over all elements is returned as a scalar. Otherwise, the sum over the given axis is returned as a 1D array.

Example

>>> import numpy as np
>>> x = np.array([
...     [0, 1, 2],
...     [0, 0, 0],
... ])
>>> sum(x)
np.int64(3)
>>> sum(x, axis=0)
array([0, 1, 2])
>>> sum(x, axis=1)
array([3, 0])

fast_array_utils.stats¶

`fast_array_utils.stats`¶