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Дата изменения: Tue Aug 16 00:41:14 2005
Дата индексирования: Sat Dec 22 10:02:08 2007
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XMM-Newton Science Analysis System


selectlib (selectlib-4.68) [xmmsas_20050815_1803-6.5.0]

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Description

Table and array processing in selectlib is controlled via user-specified boolean and arithmetic expressions. These take the form of single character strings which are composed of a variety of elements including numerical and logical constants, operators, functions, and attributes. The following operations are supported by selectlib:

operation	required expression	comment
table filtering	logic	can contain names of other columns see below
construction of new table column	arithmetic	can contain names of other columns see below
construction of new array	arithmetic	can contain symbolic references to other arrays see below

The following sections detail the syntax and semantics of the expressions driving the above operations and give sample expressions to demonstrate typical usage scenarios.