IRAF help page for package noao.digiphot.ptools, program tbdump

• tables
• columns
• expr
• datafile = STDOUT
• cdfile =
• pfile =
• rows = -
• pagwidth = 158

databases

tbdump tables columns expr

tables

columns

expr

datafile = STDOUT

cdfile =

pfile =

rows = -

pagwidth = 158

This task converts selected records from an APPHOT/DAOPHOT STSDAS table database to ASCII format and by default prints the result on the standard output. TBDUMP output does not include row numbers or column names. The TABLES package task TPRINT can be used for more readable output.

The PTOOLS version of TBDUMP described here is actually a combination of the STSDAS TABLES package tasks TSELECT and TDUMP.

The three primary uses for TBDUMP are to format STSDAS tables for input to applications which expect simple text input, allow editing that would be difficult or impossible with the TABLES package TEDIT task, such as global substitutions, and facilitate copying a table over a network to another computer. For the latter two applications the table can be dumped to three separate files containing column definitions, header parameters, and table data, edited, column data types changed, etc. The TABLES package TCREATE can be used to create a new table from the three ASCII files produced by TBDUMP. By default only the column data is dumped.

TBDUMP queries for the columns to be dumped. If columns is null ("") then all the columns are dumped. All the rows are dumped by default, but ranges of rows may be specified with the rows parameter. If the table is wider than will fit on a page, the output will consist of more than one line per row of the table, but all the columns will be printed before moving on to the next row. This is in contrast to TPRINT, which prints all rows for those columns that will fit on a page, then prints all rows for the next set of columns, etc. Character columns with multiple words are printed with enclosing quotes.

The TABLES package TLCOL task (with TLCOL.NLIST=1) may be used to generate a list of column names so there is no question about spelling or case. This list may be edited to rearrange the names and/or delete some, the list file preceded by an '@' and used as the value of the columns parameter.

The output records are selected on the basis of an input boolean expression expr whose variables are the tables column names. If after substituting the values associated with a particular record into the field name variables the expression evaluates to yes, that record is included in the output table.

The supported operators and functions are briefly described below. A detailed description of the boolean expression evaluator and its syntax can be found in the manual page for the IMAGES package HEDIT task.

The following logical operators can be used in the boolean expression.

	equal		  ==	not equal		!=
	less than	  <	less than or equal	<=
	greater than	  >	greater than or equal	>=
	or		  ||	and			&&
	negation	  !	pattern match		?=
	concatenation	  //

The pattern match character ?= takes a string expression as its first argument and a pattern as its second argument. The result is yes if the pattern is contained in the string expression. Patterns are strings which may contain pattern matching metacharacters. The metacharacters themselves can be matched by preceeding them with the escape character. The metacharacters listed below.

	beginning of string	^	end of string		$
	one character		?	zero or more characters	*
	white space		#	escape character	
	ignore case		{	end ignore case		}
	begin character class	[	end character class	]
	not, in char class	^	range, in char class	-

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)

1. Dump the "ID", "MAG" and "MAGERR" columns of the DAOPHOT package NSTAR
output to the standard output.
    pt> tbdump n4147.nst.1 "ID,MAG,MAGERR" yes
2. Dump the "ID", "MAG", and "MAGERR" columns of the above file for records
which have  MAG <= 20.0".
    pt> tbdump n4147.nst.1 "ID,MAG,MAGERR" "MAG <= 20.0"
3. Dump the "MAG" and "MAGERR" columns of the above file and pipe the
result to graph.
    pt> tbdump n4147.nst.1 "MAG,MAGERR" yes | graph STDIN
4.  Dump all the columns in the first 100 rows of the above file.
    pt> tbdump n4147.nst.1 "" yes rows="1-100"