kinematics {flowcatchR} | R Documentation

## Calculate a set of kinematics parameter from a `TrajectorySet` object, or a single parameter, or from a single trajectory (all possible combinations)

### Description

The computed set of parameters include `delta.x`, `delta.t` and `delta.v` (displacements and instantaneous velocity), `totalTime`, `totalDistance`, `distStartToEnd`, `curvilinearVelocity`, `straightLineVelocity` and `linearityForwardProgression`, Mean Squared Displacement, velocity autocorrelation, and more. If a single trajectory is specified, the computation is performed for that trajectory alone. If a parameter is specified, only that parameter is reported, either for one or all trajectories

### Usage

    kinematics(trajectoryset, trajectoryIDs = NULL,
      acquisitionFrequency = 30, scala = 50, feature = NULL)

### Arguments

`trajectoryset` | A `TrajectorySet` object
`trajectoryIDs` | The ID of a single trajectory
`acquisitionFrequency` | The frame rate of acquisition for the images, in milliseconds
`scala` | The value of micro(?)meters to which each single pixel corresponds
`feature` | Character string, the name of the feature to be computed

### Value

A `KinematicsFeaturesSet` object, or a `KinematicsFeatures` object, or an atomic value, or a list(eventually coerced to a vector)

### Author(s)

Federico Marini, marinif@uni-mainz.de, 2014

### Examples

    data("candidate.platelets")
    platelets.trajectories <- trajectories(candidate.platelets)
    # for all trajectories, all features
    alltrajs.features <- kinematics(platelets.trajectories)
    # for one trajectory, all features
    traj11features <- kinematics(platelets.trajectories,trajectoryIDs = 11)
    # for all trajectories, one feature
    alltrajs.curvVel <- kinematics(platelets.trajectories,feature = "curvilinearVelocity")

[Package flowcatchR version 1.21.0 Index]