NAME¶
funindex - create an index for a column of a FITS binary table
SYNOPSIS¶
funindex <switches> <iname> [oname]
OPTIONS¶
NB: these options are not compatible with Funtools processing. Please
use the defaults instead.
-c # compress output using gzip"
-a # ASCII output, ignore -c (default: FITS table)"
-f # FITS table output (default: FITS table)"
-l # long output, i.e. with key value(s) (default: long)"
-s # short output, i.e. no key value(s) (default: long)"
DESCRIPTION¶
The funindex script creates an index for the specified column (key) by running
funtable \-s (sort) and then saving the column value and the record number for
each sorted row. This index will be used automatically
by funtools filtering of that column, provided the index file's modification
date is later than that of the data file.
The first required argument is the name of the FITS binary table to index.
Please note that text files cannot be indexed at this time. The second
required argument is the column (key) name to index. While multiple keys can
be specified in principle, the funtools index processing assume a single key
and will not recognize files containing multiple keys.
By default, the output index file name is [root]_[key].idx, where [root] is the
root of the input file. Funtools looks for this specific file name when
deciding whether to use an index for faster filtering. Therefore, the optional
third argument (output file name) should not be used for funtools processing.
For example, to create an index on column Y for a given FITS file, use:
funindex foo.fits Y
This will generate an index named foo_y.idx, which will be used by funtools for
filters involving the Y column.
SEE ALSO¶
See
funtools(7) for a list of Funtools help pages