LEL.h

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00001 //# LEL.h: Lattice expression
00002 //# Copyright (C) 1996,1997,1998,1999,2003
00003 //# Associated Universities, Inc. Washington DC, USA.
00004 //#
00005 //# This library is free software; you can redistribute it and/or modify it
00006 //# under the terms of the GNU Library General Public License as published by
00007 //# the Free Software Foundation; either version 2 of the License, or (at your
00008 //# option) any later version.
00009 //#
00010 //# This library is distributed in the hope that it will be useful, but WITHOUT
00011 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00012 //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00013 //# License for more details.
00014 //#
00015 //# You should have received a copy of the GNU Library General Public License
00016 //# along with this library; if not, write to the Free Software Foundation,
00017 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
00018 //#
00019 //# Correspondence concerning AIPS++ should be addressed as follows:
00020 //#        Internet email: aips2-request@nrao.edu.
00021 //#        Postal address: AIPS++ Project Office
00022 //#                        National Radio Astronomy Observatory
00023 //#                        520 Edgemont Road
00024 //#                        Charlottesville, VA 22903-2475 USA
00025 //#
00026 //# $Id: Lattices.h 21521 2014-12-10 08:06:42Z gervandiepen $
00027 
00028 #ifndef LATTICES_LEL_H
00029 #define LATTICES_LEL_H
00030 
00031 
00032 #include <casacore/lattices/LEL/LatticeExpr.h>
00033 
00034 
00035 namespace casacore { //# NAMESPACE CASACORE - BEGIN
00036 
00037 // <module>
00038 
00039 // <summary>
00040 // Lattice expressions.
00041 // </summary>
00042 
00043 // <prerequisite>
00044 //   <li> module <linkto module=Lattices>Lattices</linkto>
00045 // </prerequisite>
00046 
00047 // <reviewed reviewer="Peter Barnes" date="1999/10/30" demos="">
00048 // </reviewed>
00049 
00050 // <etymology>
00051 // LEL: Lattice Expression Language.
00052 // </etymology>
00053 
00054 // <synopsis>
00055 // A <linkto class=LatticeExpr>LatticeExpr</linkto> represents
00056 // a mathematical expression of lattices. All standard operators, regions,
00057 // and many, many <linkto class=LatticeExprNode>functions</linkto>
00058 // can be used in an expression.
00059 // <br> An expression is calculated on-the-fly. Thus only when
00060 // the user gets a part of the lattice, is the expression calculated
00061 // for that part. Subexpressions resulting in a scalar are calculated
00062 // only once, on a get of the first part of the lattice expression.
00063 // <br> Note that a lattice expression is not writable, thus using
00064 // the put function on such a lattice results in an exception.
00065 // <br> <a href="../notes/223.html">Note 223</a>
00066 // gives a more detailed
00067 // explanation of the capabilities of LEL (Lattice Expression Language).
00068 // <p>
00069 // If the expression consists of images, the result can also be
00070 // treated as an image using class <linkto class=ImageExpr>ImageExpr</linkto>.
00071 // With the <src>command</src> function in
00072 // <linkto class=ImageExprParse>ImageExprParse</linkto> it is possible
00073 // to parse and execute a LEL expression given as as a string.
00074 
00075 // </module>
00076 
00077 
00078 } //# NAMESPACE CASACORE - END
00079 
00080 #endif
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