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Дата изменения: Mon Jul 9 00:08:51 2007
Дата индексирования: Sat Dec 22 12:05:59 2007
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XMM-Newton Science Analysis System


selectlib (selectlib-4.69) [xmmsas_20070708_1801-7.1.0]

Meta Index / Home Page / Description / Example expressions

Table column construction

In the following the symbols RAWX, RAWY stand for names of existing columns in the table to be processed:

• sqrt(RAWX**2 + RAWY**2)
  Constructs a new table column with radius values (provided RAWX /RAWY contain Cartesian detection coordinates)

• 100. * sin((TIME-#TIMEZERO)/#PERIOD * 360)
  Construct a ``predicted intensity'' column for a very simple time-variable source

• RAWX + 100
  Construct a new column which contains the RAWX coordinates shifted by 100 pixels