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Solution with a matrix formula
To calculate the frequency you have to create 24 classes, one for each hour. In the
next column you enter the number of emails with the function FREQUENCY.
Figure 190: FREQUENCY function
in a matrix formula
The first argument is the cell area with the times of all approximately 38,000 emails.
The second argument is the cell area E2:E25 that describes the frequency classes. To
enter the formula, first select the cell area F2:F25, then enter the formula. Then
finish the formula by using the key combination Shift+Ctrl+Enter. This indicates to
the program that you want to use a matrix formula. To indicate the matrix formula,
the program uses curly brackets.
This technique is most often known only to (and used by) advanced users.
Solution with the DataPilot
With the DataPilot you can achieve the same result much easier and faster. The
solution is also possible for less advanced users. Starting with the raw data
(Figure 189), you need only a few mouse clicks.
210 OpenOffice.org 3.3 Calc Guide
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