356 Chapter 9
Test Sequencing
Analyzing Data from the Sequencer
n Within the record Test1 there are three fields: Name, Result, and
Pass. The same holds for the record Test2.
n Therefore,
Log.Test1.Result gives an array of four values, each
representing one of the four runs.
Log[0].Test1.Result outputs a
scalar value, the
Result of Test1 in the first run (Log[0]).
The logged array of records simplifies analyzing and investigating the data.
For example, you might want to know how many tests passed in a particular
run. Or you might want to average the results of
Test2 in all runs. Or you
might want to see all of the data on
Test1 in the fourth run. All of these
queries are possible with this data structure. The next exercise performs
some analysis operations on data.
Lab 9-3: Analyzing Several Runs of Data from the
Sequencer
1. Clear the screen and open the seqdat1.vee program.
Modify the
seqdat1.vee program to run through the Sequencer three
times. Then perform some analysis operations on the data.
2. Select
Flow ⇒ Repeat ⇒ For Count and place it above the Real64
Slider
object. Change the number of iterations to 3, and connect the
data output pin to the sequence input pin of the Sequencer.
3. Delete the data line between the
Sequencer Log pin and the display.
Select
Data ⇒ Collector and place it to the right of the Sequencer.
Connect its upper left data input pin to the
Sequencer Log pin and its
XEQ pin (lower left) to the sequence output pin on the For Count object.
Connect the
Collector data output pin to the AlphaNumeric display.
Enlarge the display vertically somewhat to accommodate an array with
three elements.
The
Sequencer will now run through test1 and test2 three times
and collect the data into an array with three elements, each one holding a
record of records for each run. (Refer to the cube of data in Figure 9-14 to
visualize this.)
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