IRAFWRT

     Write IDL data in IRAF (OIF) format (.imh and .pix files).

     Does the reverse of IRAFRD.    IRAFWRT writes the "old" IRAF format
     used prior to v2.11.   However, this "old" format is still readable by
     the current version of IRAF.

    IRAFWRT, image, hdr, filename, [ PIXDIR = ]

     image - array containing data
     hdr   - The  corresponding FITS header.   Use MKHDR to create a minimal
             FITS header if one does not already exist.
     filename - Scalar string giving the name of the file to be written
             Should not include the extension name, which will be supplied
             by IRAFWRT.

     None

      PIXDIR - scalar string specifying the directory into which to write
              the IRAF pixel (.pix) file.   The default is to write the pixel
              file to the same directory as the header (.imh) file

      Image array and  FITS header are written to IRAF pixel file
               'filename'.pix and header file 'filename'.imh

       Write an empty 50 x 50 array of all zeros to an IRAF file named 'EMPTY'
       IDL> im = intarr( 50, 50)         ;Create empty array
       IDL> mkhdr, hdr, im               ;Create a minimal FITS header
       IDL> irafwrt, im, hdr, 'empty'    ;Write to a IRAF file named 'empty'

       IRAFWRT gets information about the data - image dimensions, size,
       datatype, maximum and minimum pixel values - and writes it into
       the binary part of the header. The ASCII part of the header
       is directly copied after deleting records with certain keywords
       A pixel file is created, with a header in the first 1024 bytes

       (1) The files are not created by IRAFWRT are not identical to those
               created by the IRAF routine rfits.    However, the files
               created by IRAFWRT appear to be compatible with all the IRAF
               routines tested so far.
       (2)  IRAFWRT has been tested on a limited number of data types
       (3)  IRAFWRT has only been tested on Unix and VMS systems.

       FDECOMP, IS_IEEE_BIG(), ISARRAY(), REPCHR(), STRN(), SXDELPAR, SXPAR()

       Written K. Venkatakrishna, STX February 1992
       VMS compatibility    W. Landsman      April 1992
       Work with headers without DATE-OBS or ORIGIN           August 1992
       Preserve HISTORY records with other FITS records       March 1995
       Fix case where a minimal FITS header supplied          August 1995
       Work under Alpha/OSF and Linux                         Dec.   1995
       Make sureheader has 80 char lines, use IS_IEEE_BIG()   May    1997
       Converted to IDL V5.0   W. Landsman   September 1997
       Don't apply strlowcase to .pix name   W. Landsman      April 1999
       Work with double precision            W. Landsman      May 1999
       Minimize use of obsolete !ERR         W. Landsman      Feb. 2000

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