XMM-Newton Science Analysis System


selectlib (selectlib-4.72.1) [xmmsas_20141104_1833-14.0.0]

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