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XMM-Newton Science Analysis System


evselect (evselect-3.60) [xmmsas_20070708_1801-7.1.0]

Meta Index / Home Page / Description / Filtering stage (selector)

Selection Expression

The selection expression is input as a string using the parameter expression, which is set to the value ``true'' by default. One can also filter an event list based on the data subspace information stored in another data block. The name of this block is specified with the dssblock. Which type of filter is used (expression or data subspace) is controlled with the filtertype parameter, with is set to ``expression'' by default.

For a description of the syntax rules the boolean selection expression must adhere to, as well as example expressions, please consult the documentation of the SAS package selectlib.