80
Chapter 3 Working with MultiLab
Replaces every point with the averaging of C
2
neighboring points.
Cosine
)
cos(
1
2
1
G
C
C
y
=
Draws a line of the cosine values of a data set. The argument
1
2
G
C
must be expressed in radians.
Delta Y
)
0
(
1
1
=
−
=
t
G
G
y
Draws a line of the difference between the Y-coordinate of every
point and Y-coordinate of the first point. Use this function to move the
data set along the Y-axis so that the point will intersect the Y- axis at
the origin.
Derivative
rate
sampling
t
t
y
y
y
n
n
n
1
,
2
1
1
=
∆
∆
−
=
−
+
Draws a line of the slopes of every three consecutive points of a data
set. For high recording rates and small
∆
t, this line may be very noisy,
which is why smoothing the data set is recommended before applying
the derivative function.
Divide
2
2
1
1
G
C
G
C
y
=
Draws a line of the division of two data sets
Envelope
(lower)
Lower envelope of G
1
with tolerance of C
1
points
Draws a line that connects the minimum values of a data set. The
tolerance defines the minimum distance (in sampling points) between
two minima, so that the envelope function is able to ignore random
"noises".
Envelope
(upper)
Upper envelope of G
1
with tolerance of C
1
points
Draws a line that connects the maximum values of a data set. The
tolerance defines the minimum distance (in sampling points) between
two maxima, so that the envelope function will be able to ignore
random "noises".
