def getAvgMov(track, **kwargs): SPEED_CONVERSION_FACTOR = kwargs["speedConversionFactor"] avgMov = [] diff = [] frameDistanceBetweenFrames = [] positionalDistanceBetweenFrames = [] for index in range(0, len(track.x) - 1): #the number of frames by which two adjacent elements in track are separated frameDistanceBetweenFrames = track.t[index + 1] - track.t[index] #the absolute positional distance between adjacent tracked frames positionalDistanceBetweenFrames = gen.getDistance(track.x[index], track.x[index + 1], track.y[index], track.y[index + 1]) #the distance traveled per frame between adjacent tracked frames diff.append(positionalDistanceBetweenFrames / frameDistanceBetweenFrames) return gen.nanMean(diff) * SPEED_CONVERSION_FACTOR
def getDirectionality(track, **kwargs): FIELD_VECTOR = kwargs['gradientVector'] xDiffs = gen.getDifferenceArray(track.x) yDiffs = gen.getDifferenceArray(track.y) directedness = [] #calculate instantenous directionality between frames for dx, dy in zip(xDiffs, yDiffs): vector = [dx, dy] normVector = gen.normalizeVector(vector) if normVector != 0: normFieldVector = gen.normalizeVector(FIELD_VECTOR) directionality = gen.dotProduct(vector, FIELD_VECTOR) / normVector * normFieldVector directedness.append(directionality) else: directedness.append(0) return gen.nanMean(directedness)
