IMPOS-read positions from a file into environment variables

Description:

Input a list of positions from a file to the environment variables from which CENTERS obtains its input.

CENTERS requires a list of approximate X,Y input positions which it reads from environment variables. Usually this list is created interactively with ICUR or IGCUR. IMPOS creates the list by reading it from a text file, thus allowing CENTERS to be used non-interactively.

The input file is free-format, with one X,Y position per line. The X and Y values should be separated by one or more spaces and be expressed in pixels. Up to a hundred positions may be included.

Usage:

impos file-name

Parameters:

INPFLE

INPFLE = _CHAR (Read) Name of the input file containing the list of positions.

XPIXELS

XPIXELS = _REAL (Write) List of X coordinates (pixels).

YPIXELS

YPIXELS = _REAL (Write) List of Y coordinates (pixels).

NPIXELS

NPIXELS = _REAL (Write) Number of points in the list.

Source comments:

 Input a list of positions from a file to the environment variables
 from which CENTERS obtains its input.

 The contents of an example input file containing positions for
 three objects might be:

      103.4   67.8
      231.6  134.5
      246.7   89.2