clip

The 3ms criterion commonly used to measure potential for chest injury.

Syntax

[x,y] = clip(time, accel, window, mode=0)

x = clip(time, accel, window, mode=1)

y = clip(time, accel, window, mode=2)

w = clip(time, accel, window, mode=3)

Inputs

time
The time vector of data to analyze (in seconds).
Type: double
Dimension: vector
accel
The acceleration vector. Must match length of time vector and be real only.
Type: double
Dimension: vector
window
The window width (in seconds - usually 0.003 for chest).
Type: double
Dimension: scalar
mode
0
Output the clip window x,y vectors.
1
Output the clip window x vector.
2
Output the clip window y vector.
3
Output the height of the clip window, and its left and right end points as a single vector.
Type: integer
Dimension: Dimension: scalar

Outputs

x
The x coordinates of the clip window.
Type: double
Dimension: vector
y
The y coordinates of the clip window.
Type: double
Dimension: vector
w
The height of the clip window, and its left and right end points.
Type: double
Dimension: vector

Example

Find the clip window dimensions associated with a pair of time and acceleration vectors.

t = [0: 0.0001: 0.01];
accel = sin(100 * pi * t);
w = clip(t, accel, 0.003, 3)
w = [Matrix] 1 x 3
0.89101  0.00350  0.00650

Comments

clip computes the maximum value that the linear interpolation of a time series (typically a chest resultant acceleration filtered to a 300 Hz cutoff) meets or exceeds for an interval of at least 3 ms, based on the linearly interpolated time series.