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A filter process an input event stream producing an output event file that contains a subset of parameters from a subset of the events in the input stream.

Filters consist of three components:

Filters are created and manipulated with the filter command.

Filters are created in the "disabled" state.  When a filter is enabled, it opens its output file and starts writing filtered data.  Separating the enable/disable from attaching data files allows you to produce an output file that is filtered data from several event files.  To close the file associated with a filter, disable it.

At any time, you may modify any of the components of a filter (gate, parameterlist and filename).

See the filter section of the programming guide for a description of how to read back filtered data files.


Last Modified: October 28, 2003 by: fox@nscl.msu.edu
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