Watlow ANAWIN 2 Manual de usuario Pagina 79

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Using the Trend Plot Screen
AnaWin Users Guide 7-17
Curve Fit: Use the options in the Curve Fit panel to enable curve
fitting. You can also set color, type, order, and granularity of curves.
If you have enabled an overlay graph, your curve settings are applied to
it.
On (default is off): Select On if you want to fit a curve through your
data points. Deselect On for no curve. If you have enabled an overlay
graph, your curve settings are applied to it.
Color (default is same color as data set): Use the Color pull-down
list box, to choose a color for the curve from the selected color palette.
By default, curves are drawn in the same color as the data sets they
apply to. If you choose a color, it is applied to the curves for all data
sets. Use the System property page to choose a color palette, as
described under System, later in this chapter.
Curve Type (default is Variable-Order Polynomial): Use the Curve
Type pull-down list box to choose a curve type from the Graph Con-
trol's 13 available options:
Variable-Order Polynomial Polynomial curve of
variable order
Logarithmic y = a + b * log(x)
Exponential 1 y = a * exp(b * x)
Exponential 2 y = a * x * exp(b * x)
Power y = a * (x ^ b)
Inverse 1 y = a + b / x
Inverse 2 y = a / (b + x)
Inverse 3 y = 1 / (a + b * x)
Inverse 4 y = x / (a * x + b)
Inverse 5 y = 1 / (a + b * x) ^ 2
Spline fit through all points
Moving Average Mid moving average plotted at midpoint
of averaged group
Moving Average End moving average plotted at end
point of averaged group
Order (default is 2): The Order field applies only to three curve types:
For variable-order polynomial curves, Order is the order of the
polynomial used in curve fitting. A setting of 1 produces a straight line
(the same as a best-fit line); a setting one less than the number of points
produces a curve that passes through every point.
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