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Logger Pro Reference
define new columns based on other columns using an equation. To
create new column based on an equation, enter the desired relationship
in the equation field. The contents of existing columns can be chosen
from the Variables menu, and common mathematical functions can be
chosen from the Function list. For more information see the tutorial on
creating new columns.
The functions include several appropriate to columns of data:
integral
The integral function gives the running sum of the product of point
values and the increment of the independent variable, which is usually
time. That is, it delivers the numerical integral of the data column.
derivative
The derivative function gives the slope of the indicated function with
respect to the column plotted on the horizontal axis. Only the dependent
variable (y axis) is specified in the function. The independent variable
(x axis) is determined by the graph. For example, if the graph were pH
vs. Volume, derivative(“pH”) will be ∆pH/∆Vol. The number of points
used in determining the slope is controlled in the Logger Pro
preferences found under the File menu.
smooth
The smooth function reduces noise in the indicated column. The
number of points used for a moving average is controlled in the Logger
Pro preferences found under the File menu. There is no loss of data
points from smoothing.
Graph Column On
The calculated column can be graphed on either axis. The default
choice is the y axis. Click the x-axis label to plot the new column on the
horizontal axis.
Logger Pro
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