skdh.activity.metric_enmo

skdh.activity.metric_enmo(accel, wlen, *args, take_abs=False, trim_zero=True, **kwargs)

Compute the euclidean norm minus 1. Works best when the accelerometer data has been calibrated so that devices at rest measure acceleration norms of 1g.

Parameters:

accelnumpy.ndarray

(N, 3) array of acceleration values in g.

wlenint

Window length (in number of samples) for non-overlapping windows.

take_absbool, optional

Use the absolute value of the difference between euclidean norm and 1g. Default is False.

trim_zerobool, optional

Trim values to no less than 0. Default is True.

Returns:

enmonumpy.ndarray

(N, ) array of euclidean norms minus 1.