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+// Copyright (C) 2010 - DIGITEO - Michael Baudin
+//
+// This file must be used under the terms of the GNU LGPL license.
+
+function errmsg = Checklhs ( funname , lhs , lhsset )
+  // Generates an error if the number of LHS is not in given set.
+  //
+  // Calling Sequence
+  //   errmsg = Checklhs ( funname , lhs , lhsset )
+  //
+  // Parameters
+  //   funname : a 1 x 1 matrix of strings, the name of the calling function.
+  //   lhs : a 1 x 1 matrix of floating point integers, the actual number of output arguments
+  //   lhsset : a 1 x n or n x 1 matrix of floating point integers, the authorized number of output arguments
+  //   errmsg : a 1 x 1 matrix of strings, the error message. If there was no error, the error message is the empty matrix.
+  //
+  // Description
+  // This function is designed to be used to design functions with 
+  // variable number of output arguments.
+  // Notice that it is useless to call this function if the 
+  // function definition does not use the varargout statement.
+  // Notice that a function as a minimum of 1 output argument.
+  //   Last update : 29/07/2010.
+  //
+  // Examples
+  // // The function takes 3 input arguments and 1/2 output arguments
+  // function varargout = myfunction ( x1 , x2 , x3 )
+  //   [lhs, rhs] = argn()
+  //   Checkrhs ( "myfunction" , rhs , 3 : 3 )
+  //   Checklhs ( "myfunction" , lhs , 1 : 2 )
+  //   y1 = x1 + x2
+  //   y2 = x2 + x3
+  //   varargout(1) = y1
+  //   if ( lhs == 2 ) then
+  //     varargout(2) = y2
+  //   end
+  // endfunction
+  // // Calling sequences which work
+  // myfunction ( 1 , 2 , 3 )
+  // y1 = myfunction ( 1 , 2 , 3 )
+  // [ y1 , y2 ] = myfunction ( 1 , 2 , 3 )
+  // // Calling sequences which generate an error
+  // [ y1 , y2 , y3 ] = myfunction ( 1 , 2 , 3 )
+  //
+  // // The function takes 1 or 3 output arguments, but not 2
+  // function varargout = myfunction ( x1 , x2 , x3 )
+  //   [lhs, rhs] = argn()
+  //   Checkrhs ( "myfunction" , rhs , 3 : 3 )
+  //   Checklhs ( "myfunction" , lhs , [1 3] )
+  //   y1 = x1 + x2
+  //   y2 = x2 + x3
+  //   y3 = x1 + x3
+  //   varargout(1) = y1
+  //   if ( lhs == 3 ) then
+  //     varargout(2) = y2
+  //     varargout(3) = y3
+  //   end
+  // endfunction
+  // // Calling sequences which work
+  // myfunction ( 1 , 2 , 3 )
+  // y1 = myfunction ( 1 , 2 , 3 )
+  // [ y1 , y2 , y3 ] = myfunction ( 1 , 2 , 3 )
+  // // Calling sequences which generate an error
+  // [y1 , y2] = myfunction ( 1 , 2 , 3 )
+  //
+  // Authors
+  //   Michael Baudin - 2010 - DIGITEO
+  //
+  
+  errmsg = []
+  if ( and ( lhs <> lhsset ) ) then
+    lhsstr = strcat(string(lhsset)," ")
+    errmsg = msprintf(gettext("%s: Unexpected number of output arguments : %d provided while the expected number of output arguments should be in the set [%s]."), funname , lhs , lhsstr );
+    error(errmsg)
+  end
+endfunction
+
+
+