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.help tbcalc May93 noao.digiphot.ptools
.ih
NAME
tbcalc - perform an arithmetic operation on a column in a list of apphot/daophot
ST tables databases
.ih
USAGE
tbcalc textfiles column value
.ih
PARAMETERS
.ls textfiles
The APPHOT/DAOPHOT ST tables database(s) containing the column to be recomputed.
.le
.ls column
The column to be recomputed. Column must be an integer or real column
in the input file(s).
.le
.ls value
The arithmetic expression used to recompute the specified column.
Value may be an integer or real expression but must match the data
type of column.
.le
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DESCRIPTION
TBCALC reads in the value of the \fIcolumn\fR
from a set of APPHOT/DAOPHOT ST tables databases, replaces it with a new
value specified by the arithmetic expression \fIvalue\fR,
and updates the ST tables databases(s).
The expression \fIvalue\fR consists of variables which are column names
in the APPHOT/DAOPHOT ST tables database.
TBCALC uses the TABLES package task TCALC to actually perform the
arithmetic operation.
The supported
arithmetic operators and functions are briefly described below.
.nf
addition + subtraction -
multiplication * division /
negation - exponentiation **
absolute value abs(x) cosine cos(x)
sine sin(x) tangent tan(x)
arc cosine acos(x) arc sine asin(x)
arc tangent atan(x) arc tangent atan2(x,y)
exponential exp(x) square root sqrt(x)
natural log log(x) common log log10(x)
minimum min(x,y) maximum max(x,y)
convert to integer int(x) convert to real real(x)
nearest integer nint(x) modulo mod(x)
.fi
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EXAMPLES
1. Change the XCENTER and YCENTER fields to XCENTER + 5.4 and YCENTER + 10.3
respectively in a file produced by the daophot package allstar task.
.nf
pt> tbcalc m92.als.1 xcenter "xcenter+5.4"
pt> tbcalc m92.als.1 ycenter "ycenter+10.3"
.fi
2. Add a constant to the computed magnitudes produced by the daophot
package nstar task.
.nf
pt> tbcalc n4147.nst.2 mag "mag+3.457"
.fi
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BUGS
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SEE ALSO
ptools.txcalc,tables.tcalc,ptools.pcalc
.endhelp
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