add_col(crate, cratedata)
- crate - input crate
- cratedata - CrateData object to be added
The add_col command adds the column to the crate. If the
column already exists in the crate, it is replaced.
The command returns a "1" if the column is successfully added.
The column is only added to the crate. The write_file
("ahelp write_file")
command can be used to save the modified crate to a file.
>>> cr = read_file("evt2.fits")
>>> print get_col_names(cr)
['CHANNEL' 'E_MIN' 'E_MAX']
>>> emin = copy_colvals(cr, "E_MIN")
>>> emax = copy_colvals(cr, "E_MAX")
>>> emid = 0.5 * (emin + emax)
>>> col = CrateData()
>>> col.name = "E_MID"
>>> col.load(emid, 1)
1
>>> add_col(cr, col)
1
>>> print get_col_names(cr)
['CHANNEL' 'E_MIN' 'E_MAX' 'E_MID']
Here we create a column called E_MID, whose values are the
mid-points of the E_MIN and E_MAX columns, and then add it
to the crate.
See the
bug pages
on the CIAO website for an up-to-date listing of known bugs.
- py.crates
-
add_image,
add_key,
col_exists,
copy_colvals,
delete_col,
delete_image,
delete_key,
get_col,
get_col_names,
get_colvals,
get_number_cols,
is_virtual,
print_col_names,
read_arf,
read_file,
read_pha,
read_rmf,
set_colvals,
write_arf,
write_file,
write_pha,
write_rmf
- py.crates_contrib
-
make_table_crate,
write_columns
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