.help psort Aug91 noao.digiphot.ptools
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NAME
psort -- sort an APPHOT/DAOPHOT database file
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USAGE
psort infiles field
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PARAMETERS
.ls infiles
The input APPHOT/DAOPHOT databases to be sorted. The sort is performed in place.
.le
.ls field
The field to be sorted on. If the input file is a text database,
\fIfield\fR may be any quantity defined by
the APPHOT/DAOPHOT #K and #N keywords. If the input file is an STSDAS
table database \fIfield\fR may be any column name. \fIField\fR may be
of type integer or real, in which case a numeric sort is performed,
boolean, in which case the boolean constant "no" is assumed to have a
smaller value than "yes", or character in which case an alphabetic sort
is performed.
.le
.ls ascend = yes
Sort in increasing value order.
.le
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DESCRIPTION
PSORT is a simple task which accepts an APPHOT/DAOPHOT database file
and sorts it in place based on the value of the selected quantity
\fIfield\fR. By default the sort is in increasing order of the value
of field, but a reverse sort can be performed by 
setting \fIascend\fR = no.

If \fIfield\fR is a real or integer the sort is numeric, if boolean
the constant "no" is assumed to have a smaller value than "yes", if
character the sort is alphabetic.

PSORT is a simple CL script which call TXSORT if the input database is
a text file and TSORT if the input database is a text file.
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EXAMPLES

1.  Sort the output of the APPHOT task PHOT in increasing order of
the y coordinate.

.nf
    pt> psort m92.mag.1 YCENTER
.fi

2. Sort the output of the DAOPHOT task ALLSTAR in increasing order of
magnitude.

.nf
    pt> psort m92.al.1 MAG
.fi

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TIME REQUIREMENTS
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BUGS
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SEE ALSO
ptools.txsort,tables.tsort,ptools.tbsort
.endhelp