|AHELP for CIAO 4.2||
Determine if the input column from the crate is a virtual column.
- crate - input crate
- colname - the name of the column
The is_virtual command returns "1" if the specified column is a virtual column and "0" if it is not; see "ahelp dm" for information on virtual columns.
>>> cr = read_file("evt2.fits"); >>> is_virtual(cr, "time"); 0 >>> is_virtual(cr, "eqpos"); 1
An event file is read into the crate "cr". The is_virtual command is used to determine that the eqpos(ra,dec) column is virtual, but the time column is not.
See the bug pages on the CIAO website for an up-to-date listing of known bugs.