CONV_UNIX_VAX

      To convert Unix IDL data types to Vax IDL data types.

      CONV_UNIX_VAX assumes the Unix IDL data type is IEEE standard in either
      big-endian or little-endian format.

      CONV_UNIX_VAX, variable, [ SOURCE_ARCH = ]

      variable - The data variable to be converted.  This may be a scalar
            or an array.  Valid datatypes are integer, longword,
            floating point, and double precision. The result of the
            conversion is passed back in the original variable.

      SOURCE_ARCH = name (string) of source architecture
            if using this function on a VAX, otherwise
            !VERSION.ARCH is used to determine the conversion.
            **If run on a VAX, the default is to assume the source to be
            a little-endian machine with IEEE floating point
            (e.g. MIPSEL or Alpha***).

      Requires that data be from IEEE standard Unix machines
      (e.g. SUN, MIPSEL, or Alpha).

      Read a 100 by 100 matrix of floating point numbers from a data
      file created on a Sun.  Then convert the matrix values into
      VAX format.
      IDL> openr,1,'vax_float.dat
      IDL> data = fltarr(100,100)
      IDL> forrd,1,data
      IDL> CONV_UNIX_VAX,data,SOURCE_ARCH='sparc'

      Version 1      By John Hoegy            13-Jun-88
      04-May-90 - WTT:  Created CONV_UNIX_VAX from VAX2SUN,
                         reversing floating point procedure.
       Modified  P. Keegstra             September 1994
           Implemented MIPSEL and ALPHA architecture,
           distinguishing VMS and OSF
       Modified  P. Keegstra             February 1995
           Added 386 PC based architectures
       If since V5.1 then VMS is always little endian    June 1998
       Convert to IDL V5.0   W. Landsman                 June 1998

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