Delete a column from a crate.
- crate - input crate
- colid - column name or number, where the first column is numbered 0
The delete_col command removes the column from the crate. The
print_col_names command
("ahelp print_col_names")
lists all the columns in the file with the corresponding numbers.
The command returns a "1" if the column is successfully
deleted. The column is only deleted from the data in the
crate; it's not removed from the input file. The write_file command
("ahelp write_file")
can
be used to save the modified crate to a file.
>>> cr = read_file("evt2.fits")
>>> print(get_col_names(cr))
['CHANNEL' 'COUNTS' 'STAT_ERR' 'BACKGROUND' 'BIN_LO' 'BIN_HI']
>>> delete_col(cr, "STAT_ERR")
1
>>> col_exists(cr, "STAT_ERR")
0
>>> write_file(cr, "nostat.fits")
1
Delete the STAT_ERR column from the crate, then use the
col_exists command to confirm it has been deleted. Write
the crate to nostat.fits.
>>> cr = read_file("evt2.fits")
>>> delete_col(cr, 4)
1
>>> col_exists(cr, "BACKGROUND")
0
>>> write_file(cr, "edit.fits")
1
Delete column number 4 - the BACKGROUND column in this
file - from the crate, then write the crate to file edit.fits.
See the
bug pages
on the CIAO website for an up-to-date listing of known bugs.
- py.crates
-
add_col,
add_image,
add_key,
col_exists,
copy_colvals,
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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