trackpy.emsd¶

trackpy.emsd(traj, mpp, fps, max_lagtime=100, detail=False, pos_columns=['x', 'y'])¶

Compute the ensemble mean squared displacements of many particles.

Parameters:

Parameters:	traj : DataFrame of trajectories of multiple particles, including columns particle, frame, x, and y mpp : microns per pixel fps : frames per second max_lagtime : intervals of frames out to which MSD is computed Default: 100 detail : Set to True to include <x>, <y>, <x^2>, <y^2>. Returns only <r^2> by default.
Returns:	Series[msd, index=t] or, if detail=True, DataFrame([<x>, <y>, <x^2>, <y^2>, msd], index=t)

traj : DataFrame of trajectories of multiple particles, including

columns particle, frame, x, and y

mpp : microns per pixel

fps : frames per second

max_lagtime : intervals of frames out to which MSD is computed

Default: 100

detail : Set to True to include <x>, <y>, <x^2>, <y^2>. Returns

only <r^2> by default.

Returns:

Series[msd, index=t] or, if detail=True,

DataFrame([<x>, <y>, <x^2>, <y^2>, msd], index=t)

Notes

Input units are pixels and frames. Output units are microns and seconds.