----- file created by makedoc on: Tue Apr  1 15:29:53 2008
----- Documentation for /scisoft/xop2.3/extensions/shadowvui/src/lib/matr2presur.pro -----

 NAME:
	matr2presur
 PURPOSE:
	to write the idl z,x,y variables containing a surface in a file
	with the SHADOW 'presurface' format.
 CATEGORY:
       SHADOW's utilities
 CALLING SEQUENCE:
	matr2presur,z,x,y
 INPUTS:
	z,x,y variables z=fltarr(nx,ny), x=fltarr(nx) and y=fltarr(ny)
	with the surface
 KEYWORD PARAMETERS:
		FILE= The name of the output file where write the
 OUTPUTS:
	A file is written to the disk.
 PROCEDURE:
	Straightforward.
 MODIFICATION HISTORY:
	by M. Sanchez del Rio. ESRF. Grenoble, Jun 1994
	
