Move Schur operator into correct place

Grid/algorithms/Algorithms.h

@@ -31,6 +31,7 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
 
 #include <Grid/algorithms/SparseMatrix.h>
 #include <Grid/algorithms/LinearOperator.h>
+#include <Grid/algorithms/SchurDiagTwoKappa.h>
 #include <Grid/algorithms/Preconditioner.h>
 
 #include <Grid/algorithms/approx/Zolotarev.h>

Grid/algorithms/LinearOperator.h

@@ -26,8 +26,7 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
     See the full license in the file "LICENSE" in the top level distribution directory
 *************************************************************************************/
 /*  END LEGAL */
-#ifndef  GRID_ALGORITHM_LINEAR_OP_H
+#pragma once 
-#define  GRID_ALGORITHM_LINEAR_OP_H
 
 NAMESPACE_BEGIN(Grid);
 
@@ -496,5 +495,3 @@ public:
 };
 
 NAMESPACE_END(Grid);
-
-#endif

Grid/algorithms/SchurDiagTwoKappa.h

@@ -0,0 +1,102 @@
+/*************************************************************************************
+
+    Grid physics library, www.github.com/paboyle/Grid 
+
+    Source file: SchurDiagTwoKappa.h
+
+    Copyright (C) 2017
+
+Author: Christoph Lehner
+Author: Peter Boyle <paboyle@ph.ed.ac.uk>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+    See the full license in the file "LICENSE" in the top level distribution directory
+*************************************************************************************/
+/*  END LEGAL */
+#pragma once
+
+NAMESPACE_BEGIN(Grid);
+
+// This is specific to (Z)mobius fermions
+template<class Matrix, class Field>
+class KappaSimilarityTransform {
+public:
+  INHERIT_IMPL_TYPES(Matrix);
+  Vector<Coeff_t> kappa, kappaDag, kappaInv, kappaInvDag;
+
+  KappaSimilarityTransform (Matrix &zmob) {
+    for (int i=0;i<(int)zmob.bs.size();i++) {
+      Coeff_t k = 1.0 / ( 2.0 * (zmob.bs[i] *(4 - zmob.M5) + 1.0) );
+      kappa.push_back( k );
+      kappaDag.push_back( conj(k) );
+      kappaInv.push_back( 1.0 / k );
+      kappaInvDag.push_back( 1.0 / conj(k) );
+    }
+  }
+
+  template<typename vobj>
+  void sscale(const Lattice<vobj>& in, Lattice<vobj>& out, Coeff_t* s) {
+    GridBase *grid=out.Grid();
+    out.Checkerboard() = in.Checkerboard();
+    assert(grid->_simd_layout[0] == 1); // should be fine for ZMobius for now
+    int Ls = grid->_rdimensions[0];
+    thread_for(ss, grid->oSites(),
+    {
+      vobj tmp = s[ss % Ls]*in[ss];
+      vstream(out[ss],tmp);
+    });
+  }
+
+  RealD sscale_norm(const Field& in, Field& out, Coeff_t* s) {
+    sscale(in,out,s);
+    return norm2(out);
+  }
+
+  virtual RealD M       (const Field& in, Field& out) { return sscale_norm(in,out,&kappa[0]);   }
+  virtual RealD MDag    (const Field& in, Field& out) { return sscale_norm(in,out,&kappaDag[0]);}
+  virtual RealD MInv    (const Field& in, Field& out) { return sscale_norm(in,out,&kappaInv[0]);}
+  virtual RealD MInvDag (const Field& in, Field& out) { return sscale_norm(in,out,&kappaInvDag[0]);}
+
+};
+
+template<class Matrix,class Field>
+class SchurDiagTwoKappaOperator :  public SchurOperatorBase<Field> {
+public:
+  KappaSimilarityTransform<Matrix, Field> _S;
+  SchurDiagTwoOperator<Matrix, Field> _Mat;
+
+  SchurDiagTwoKappaOperator (Matrix &Mat): _S(Mat), _Mat(Mat) {};
+
+  virtual  RealD Mpc      (const Field &in, Field &out) {
+    Field tmp(in.Grid());
+
+    _S.MInv(in,out);
+    _Mat.Mpc(out,tmp);
+    return _S.M(tmp,out);
+
+  }
+  virtual  RealD MpcDag   (const Field &in, Field &out){
+    Field tmp(in.Grid());
+
+    _S.MDag(in,out);
+    _Mat.MpcDag(out,tmp);
+    return _S.MInvDag(tmp,out);
+  }
+};
+
+NAMESPACE_END(Grid);
+
+