Multichannel-systems NeuroExplorer Manual de usuario descargar pdf (Pagina 259)

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5.5.8.29. PositionSpeed Function

PositionSpeed Function

Calculates the position speed from X and Y coordinate variables and creates a new continuous

variable.

Syntax

variableReference PositionSpeed(varX, varY, deltaT, smoothRadius)

Parameters

Parameter Type Description

varX variableReference Reference to the variable.

varY variableReference Reference to the variable.

deltaT double Time step for speed calculation.

smoothRadius double Smooth parameter. See Comments.

Returns

Reference to the new variable

Comments

PositionSpeed operation calculates the scalar speed of a pair of the position variables.

1. First, for each data point of Position variable PosX[T], where T is time, the raw scalar speed is

calculated:

dX = PosX[ T + DeltaT ] - PosX[ T ]

dY = PosY[ T + DeltaT ] - PosY[ T ]

RawScalarSpeed[ T ] = sqrt( dX*dX + dY*dY ) / DeltaT

If there is no data point at time T + DeltaT, a linear interpolation is used to calculate PosX[T + DeltaT]

and PosY[T + DeltaT].

2. Second, RawScalarSpeed is smoothed with the Gaussian filter. The parameters of the filter are

such that the width (in seconds) of the Gaussian curve at half the height is equal to the value of

Smooth parameter. If Smooth = 0, Gaussian filter is not applied.

Usage

NexScript

doc = GetActiveDocument()

doc.speed = PositionSpeed(doc.LED1_X, doc.LED1_Y, 0.1, 0.5)

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Multichannel-systems NeuroExplorer Manual de usuario Pagina 259

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