modif resize member: recompute basis only if refcell or ecut changes

git-svn-id: http://qboxcode.org/svn/qb/trunk@177 cba15fb0-1239-40c8-b417-11db7ca47a34

src/Basis.C

@@ -3,7 +3,7 @@
 // Basis.C
 //
 ////////////////////////////////////////////////////////////////////////////////
-// $Id: Basis.C,v 1.11 2003-11-20 20:30:26 fgygi Exp $
+// $Id: Basis.C,v 1.12 2004-03-11 21:45:31 fgygi Exp $
 
 #include "Basis.h"
 #include "Context.h"
@@ -311,6 +311,14 @@ bool BasisImpl::resize(const UnitCell& cell, const UnitCell& refcell,
   assert(cell.volume() >= 0.0);
   assert(refcell.volume() >= 0.0);
   
+  if ( ecut == ecut_ && refcell == refcell_ && refcell_.volume() != 0.0 )
+  {
+    cell_ = cell;
+    // only the cell changes, ecut and the refcell remain unchanged
+    update_g();
+    return true;
+  }
+  
   ecut_ = ecut;
   cell_ = cell;
   refcell_ = refcell;