Fourier ImagiProbe, Руководство пользователя

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Chapter 3 Working with MultiLab 79
Polynomial
n
n n
a x a x a y
+ + + = −
L
1
1 0
Draws a line of polynomial least square fit (you must select an order
between 1 and 6.)
Power
n
x
a
y
=
Draws a line of power least square fit.
Exponential
bx
ae y
=
Draws a line of exponential least square fit.
MultiLab displays the curve fit equation and the correlation coefficient (R
2
) on the
information bar below the graph
2.Averaging
The average function replaces every point with the average of
n
neighboring points
from both sides of the point.
Low averaging:
5
=
n
, Medium averaging:
11
=
n
, High averaging:
41
=
n
.
3.Functions
In the formulas below, G
1
and G
2
represent selected data sets, and C
1
and C
2
are
constants that you can enter. The constant
’
s default value is 1.
Absolute
1 2 1
G C C y
=
Draws a line of the absolute values of a data set.
Add
2 2 1 1
G C G C y
+ =
Draws a line of the addition of two data sets
Arccosine
) arccos(
1 2 1
G C C y
=
Draws a line of the arccosine values of a data set (in radians).
Arccosine is the angle whose cosine is
1 2
G C
. The argument
1 2
G C
must be between
–
1 and 1.
Arcsine
) arcsin(
1 2 1
G C C y
=
Draws a line of the arcsine values of a data set in radians. Arcsine is
the angle whose sine is
1 2
G C
. The argument
1 2
G C
must be between
–
1 and 1.
Average
C
1
·{average of C
2
points around G
1
}