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Дата изменения: Wed Jul 2 11:03:57 2008
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XMM-Newton Science Analysis System Page: 1
tabcalc
July 2, 2008
Abstract
Perform arbitrary math with columns in a table. Part of the dscalc package.
1 Instruments/Modes
Instrument Mode
n/a n/a
2 Use
pipeline processing no (?)
interactive analysis yes
3 Description
tabcalc performs arbitrary calculations on table columns.
tabcalc makes use of selectlib to perform arbitrary math on table columns. Any operation supported
by selectlib is allowed. The name and type of the result column can be specied on the command line.
If the result column exists, it will be overwritten.
3.1 Examples
tabcalc --tables=set.ds:table --expression="time + 43" --column=time43
Create the column time43 by adding row by row 43 to the values read from the column
time in the table table in the dataset set.ds.
tabcalc --tables=set.ds:table --expression="time + 43" --column=time43 --columnunit=s
--columnlabel="corrected time"
As above, but now the unit and comment elds of the result column time43 are set.
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XMM-Newton Science Analysis System Page: 2
4 Parameters
This section documents the parameters recognized by this task (if any).
Parameter Mand Type Default Constraints
tables yes T
List of tables to operate on (fully qualied names).
expression no s TRUE
An arbitrary math expression involving any number of columns present in the table.
columntype no s real64 int8jint16juint16jint32juint32jreal32jreal64
Type of the result column.
column no s RESULT
Name of the column holding the result. It may be an existing column.
columnunit no s unit
Unit of the result column.
columnlabel no s label
Label of the result column.
5 Errors
This section documents warnings and errors generated by this task (if any). Note that warnings and
errors can also be generated in the SAS infrastructure libraries, in which case they would not be docu-
mented here. Refer to the index of all errors and warnings available in the HTML version of the SAS
documentation.
6 Input Files
1. Any data set that can be read by the dal.
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XMM-Newton Science Analysis System Page: 3
7 Output Files
1. The input data set, modied as required.
8 Algorithm
read expression
foreach table
open table
call selectlib with table and expression
close table
end foreach
9 Comments
10 Future developments
References
xmmsas 20080701 1801-8.0.0