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XMM-Newton Science Analysis System


selectlib (selectlib-4.68) [xmmsas_20060628_1801-7.0.0]

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Selected-function

The selected function facilitates step-wise filtering of tables. Used as a sub-expression it evaluates to true for a particular row if that rows has been selected in the selection process preceding the current one. If the table undergoes selection for the very first time, selected returns true for all table rows, i.e., has no effect. As an example, the expression:

   SELECTED && PHA >= 10

selects all rows which where selected in the previous selection cycle and with PHA values greater than or equal to 10.