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AST_COLUMNNAME - Get the name of the column at a given index within the Table

Description:
This function returns a string holding the name of the column with the given index within the Table.

This function is intended primarily as a means of iterating round all the columns in a Table. For this purpose, the number of columns in the Table is given by the Ncolumn attribute of the Table. This function could then be called in a loop, with the index value going from one to Ncolumn.

Note, the index associated with a column decreases monotonically with the age of the column: the oldest Column in the Table will have index one, and the Column added most recently to the Table will have the largest index.

Invocation:
RESULT = AST_COLUMNNAME( THIS, INDEX, STATUS )
Arguments:
THIS = INTEGER (Given)
Pointer to the Table.
INDEX = INTEGER (Given)
The index into the list of columns. The first column has index one, and the last has index "Ncolumn".
STATUS = INTEGER (Given and Returned)
The global status.
Returned Value:
AST_COLUMNNAME = CHARACTER $*$ ( AST__SZCHR )
The upper case column name.
Notes:
  • A blank string will be returned if this function is invoked with STATUS set to an error value, or if it should fail for any reason.


next up previous 264
Next: AST_COLUMNNULL - Get or set the null value for an integer column of a FITS table
Up: AST Routine Descriptions
Previous: AST_CMPREGION - Create a CmpRegion

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2009 Science \& Technology Facilities Council