txdump textfiles fields expr
textfiles
The APPHOT/DAOPHOT text database whose fields from selected records are to
be printed.
fields
A template defining the fields to be printed from each selected record.
The fields are specified by keywords defined in the text database output
files #K and #N entries. Upper or lower case and minimum match
abbreviations are permissible. Some fields such as "mag" may have
multiple entries. An individual entry can be referenced by specifying an
array index, e.g. "mag[2]" or several values can be selected by
specifying a range of elements, e.g. "mag[1-3]". The fields are output in
the order in which they are specified in the template.
expr
The boolean expression to be evaluated once per record.
Only the fields in those records for which the boolean expression
evaluates to yes are printed.
If expr = "yes", the specified fields in all the records are
printed.
headers = no
Preserve the APPHOT/DAOPHOT text database output format. The selected
fields are printed on the standard output, preceded by parameters list,
if parameters = yes, and the keyword, units,
and format information, exactly as they appear in the text database.
parameters = yes
Print the keyword parameters records in APPHOT/DAOPHOT format on the
standard output if headers = yes.
TXDUMP selects a subset of fields specified by the fields parameter from an APPHOT/DAOPHOT text database or a list of databases by evaluating a boolean expression supplied by the user and prints the results on the standard output. If headers = no, the resultant output is in simple list format with all the specified fields in one line of text and adjacent fields separated by whitespace. The fields are printed in the order in which they appear in expr. If headers = yes, the selected fields are printed on the standard output, preceded by the parameter list, if parameters = yes, and the keyword, units, and format information, exactly as they appear in the text database. Newlines will not be inserted in the output so users should take care not to exceed the IRAF text file line limit of 161 characters.
The output records are selected on the basis of an input boolean expression expr whose variables are the field names specified by the #N keywords or the parameters specified by the #K keywords in the APPHOT/DAOPHOT text database. 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 -
The expression may also include arithmetic operators and functions. The following arithmetic operators and functions are supported.
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. Print the fields XCENTER and YCENTER from the output of the APPHOT CENTER task.
pt> txdump image.ctr.1 XCENTER,YCENTER yes
2. Select the fields ID, XCENTER, YCENTER and the first three magnitudes MAG{1-3] from the output of the APPHOT PHOT task.
pt> txdump image.mag.2 "ID,XCEN,YCEN,MAG[1-3]" yes
3. Print all fields for all records in the above file with a magnitude through the first aperture of less than 20.0.
pt> txdump image.mag.2 * "MAG[1] < 20.0"
4. Print the id and all magnitudes for which magnitudes 1 and 2 are < 20.0 from a file which is the output of the APPHOT PHOT task.
pt> txdump image.mag.3 ID,MAG "MAG[1] < 20.0 && MAG[2] < 20.0"
5. Select the ID, XCENTER, YCENTER, MSKY and MAG fields from the output of the DAOPHOT NSTAR task for records where the magnitude is not INDEF, while preserving the format of the text database so it is suitable for input into a rerun of NSTAR.
pt> txdump image.nst.1 "ID,XCENTER,YCENTER,MSKY,MAG" "MAG[1] != INDEF" headers+
TXDUMP does not allow arrays in the expression field.
Users should not dump more fields than fill a 161 character textline as IRAF does not currently fully support longer text lines.
images.hedit, ptools.tbdump, tables.tdump, ptools.pdump,