Data are recorded in a histogram, when using the method * sample*.
This method takes the value of the sample and its frequency, say * x* and * y* and adjusts the
internal histogram data. If the type of the histogram is equal to
FREQUENCY, the * y* value is added to the sum of frequencies of the
column, that * x* falls
in. If the type of the histogram is equal to WEIGHTED, the * y* value
is multiplied by the time since the last sample was taken.
In a histogram of type SERIES, the x-axis represents time, so the x value
is ignored and the * y* value is added to the columns between the last column
in which a sample was put and the column that represents the current
simulation time. In the case of the dining philosophers, for
example, a histogram of type FREQUENCY suffices. If we were interested
in weighted averages, as is the case in analyzing queue sizes, the
histogram should be of type WEIGHTED.

The * report* methods use the * sample* function. If these
methods are used the library adds the samples.

Tue Oct 31 09:27:21 MET 1995